TITLE OF THE INVENTION A BACKPACK (BOOKBAG), A LAPTOP CARRYING CASE, AND A BRTEFCASE CONVERTIBLE INTO A SINGLE-LEG SUPPORTED WORKSTATION (DESK) FIELD OF THE INVENTION A BACKPACK (BOOKBAG), A LAPTOP CARRYING CASE, AND A BRIEFCASE CONVERTTBLE INTO A SINGLE-LEG SUPPORTED WORKSTATION (DESK) VIA AN SINGLE EXTENDABLE AND ADJUSTABLE TELESCOPIC LEG. THE PRESENT INVENTION SEEKS TO PROVIDE IMPROYED BACKPACKS (BOOKBAGS), LAPTOP CARRYING CASES AND BRIEFCASE FEATURES, EQUIPMENT , AND ASSEMBLIES. BACKGROUND OF THE INVENTION A Backpack (Book bag), Laptop Carrying Case, and a Briefcase that converts into a workstation (desk) via A SINGLE telescopic leg, All other patents using a telescopic leg have two or more legs, most commonly, four legs. My advanced Backpack (Book bag), Laptop Carrying Case, and briefcase only have one telescopic (extendable and retactable) leg that can be extended out to reach over three feet in height, complete with a chair for sitting and other features. Travelers and commuters have long used backpacks Oook bags), laptops Carrying Cases, and Briefcases to carry various items. Students use backpacks (book bags) to carry their school books and supplies, while hikers utilizs backpacks/book bags for housing their hiking supplies. They use Laptop Carrying Cases to carry their laptop computers and supplies and Professionals use briefcases to carry their important doctrments and supplies. However, these respective bags and carrying cases have been limited in their usage to simply being a carrying case and housing unit. All this will change as the advanced Backpack (Book bag), Laptop Carrying Case and briefcase can transform into a workable desk where students can now do their school assignments on their front steps, back porch, at a park sitting, on the subway, or at acoffee shop with a chair for siuing. Hikers can use their advanced Backpack (Book bag) to set up a dining table with a chair on a mountain top. NO OTHER Backpack (Book bag), Laptop Carrying Case or Briefcase has either single telescopic leg support or a chair, whereas our advanced Backpack (Book bag), Laptop carrying case, and Briefcase feature both. The advanced Backpack @ook bag), Laptop Carrying Case, and briefcase also have two USB ports where users can charge their phones and other electronic devices simultaneously. The advanced smart" Backpack (Book bag), Laptop Carrying Case, and briefcase feature a rechargeable battery to power the USB port, a cup holder for beverages, a voice-activated-digital assistant application, a phone holder for hand-free working, a portable chair for sitting, wheels on the bottom ofthe SINGLE telescopic leg for easy fiaveling when used as a workstation (desk) and a tablet computer for video conference, watching movies and any other usage of a Tablet computer all of which, including having a SINGLE telescopic leg, is not readily available on conventional Backpack (Book bag), Laptop Carrying Case and briefcase respectively. The Backpack (Book bag) and the Briefcase have a desktop surface that can extend out to create a larger desktop surface, with wheels on the bottom for easy traveling. The Laptop Carrying Case has an electrical housing unit with a 15 AMP outlet where users can now charge their laptop computer from their Laptop Carrying Case and TWO clamps to secure the users,laptop to the workstation (desk). The use of a combination of a Backpack (Book bag), alaptop Carrying Case and briefcase, and a workstation (desk) may be known in other patents but no other patents have the combination with a SINGLE telescopic leg specifically, combination Backpack @ook bag), Laptop carrying case and brieftase with single telescopic leg support. While other devices fulfill their respective particular objective and requirements in their respective patents, none will disclose a SINGLE telescopic leg with a desktop, a portable chair, Bluetooth speakers, and a Tablet computer amongst other 'tings. prior art stopped solely as having two or more leg support units where mine advanced it by workstation (desk) via a single telescopic leg support unit. SUMMARY OF THE INVENTION A convertible Backpack (Book bag), Laptop Carrying Case, and Briefcase which has a first operative orientation in which it functions as a conventional Backpack (Book bag), Laptop Carrying Case, and Briefcase respectively, and a second operative orientation in which it functions as a SINGLE leg supported workstation (desk) respectively. In a carrying, Backpack (Book bag), Laptop Carrying Case or Briefcase, operative orientation, a Base portion of the Backpack (Book bag), Laptop Carrying Case, and Briefcase is disposed substantially parallel to the Front Portion. In this operative orientation, a singular telescopic leg support structure is housed within a base compartment of the Backpack (Book bag), Laptop Carrying Case, and Briefcase, and when the comparfinent is unzipped it exposes the single telescopic leg. When the single leg support is partially or fully lowered from its housing unit, it converts the Backpack (Book bag), Laptop Carrying Case, and Briefcase into a workstation (desk) operative orientation. The single telescopic extendable and re&actable leg support sfuctures are in an extended mode perpendicularly away from the Backpack (Book bag), Laptop Carrying Case, and Briefcase to support the Backpack (Book bag), Laptop Carrying Case, and Briefcases on a support sur ce, such as a floor or arry other base surface. The disclosedtechnology generally relates to convertible Backpack (Book bag), Laptop Carrying Case, and Briefcase and, more specifically, to a Backpack (Book bag), Laptop Carrying Case, and Briefcase, which may be converted into a portable workstation (desk) via single leg support suitable for completing assignments at any locations indoors or outdoors, complete with a sitting chair for a total workstation environment. All other patents using a telescopic leg have two or more legs, most commonly four legs, whereas my advances the convertible Backpack (Book bag), Laptop Carrying Case, and Briefcase have a single telescopic (extendable and retractable) leg. The single extendable and retractable telescopic leg is located on the Backpacks' (Book bag), Laptop Carrying Cases' and Briefcases' REAR FACE and is adjustable to reach different heights to suit each customer comfortably. The REAR FACE of the Backpack (Book bag), Laptop Carrying Case, and Briefcase can be defined as the portion of the Backpack (Book bag), Laptop Carrying Case, and Briefcase that is paralleled to the front of the Backpack (Book bag), Laptop Carrying Case and Briefcase and should not be confused or mistaken for the bottom of the Backpack (Book bag), Laptop Carrying Case and Briefcase. The base of the telescopic leg will have a secure circular base to ensure sturdiness and stability on all surfaces and has four retractable wheels on the bottom Oase) of the leg for easy tansportation while used as a desk. The advanced portable workstation (desk) Backpack (Book bag), Laptop Carrying Case, and Briefcase will have two blue tooth speakers on the single telescopic leg located on the Backpack (Book bag), Laptop Carrying Case, and Briefcase's rear face so the customer can listen to music while completing their work. The advanced portable workstation (desk) Backpack (Book bag), Laptop Carrying Case, and Briefcase will also have a rechargeable battery to power the two PORTABLE USB charging ports so customers can charge their cell phones and other electrical dives as well as a cup holder for hold consumer's beverages, a housing unit for the telescopic leg, a voice-activated-digital assistant application like Siri and Alexa manufactured by Apple and Amazon respectively where users can ask questions and receive answers to their inquiries, a portable chair located in the Backpack (Book bag), Laptop Carrying Case and Briefcase's Rear Face so the Backpack (Book bag), Laptop Carrying Case and Briefcase's desk can be utilized at any location while sitting down, a phone holder for hands-free talking, a single telescopic leg having a locking mechanism able to lock the telescopic leg at heights over 3 fee! and a telescopic (extendable and rekactable) leg can be extended out to reach over three feet in height. And a tablet computer on the FRONT PORTION of the Backpack (Book bag), Laptop Carrying Case, and Briefcase for intemet usage, video conference calls, watching movies, and other tablet computer usage. The Backpack (Book bag) Base Portion can detach from the Front Portion of the Backpack (book bag) via a 360-degree zipper and when the Base Portion is partially or fully detached from the Front Portiou it converts the Backpack (Book bag) into a workstation operative orientation. The advanced portable workstation (desk) Backpack (Book bag) will have a retactable desktop surface extending out on the left and the rigtrt sidewalls to create a larger desktop surface to suit customers' needs and comfort, a pencil hotder, a first pair of extendable and retractable deslttop sidewalls and a second pair of extendable and retactable desktop sidewalls being connected to the Backpack (Book bag) body on the base portion. The Backpack (Book bag)'s arm/shoulder straps are detaehable, whereas the straps won't interfere with desktop Noge, a rear face; the REAR FACE of the Backpack (Book bag) can be defined as the portion of the Backpack (Book bag) that rests on the consumers' back. The Backpack (Book bag) has five comparrnents and a desktop base portion. Compartment#l is the smallest comparhnent made of the material used to house pens, pencils, small note pads, make-up, and a calculator.Compartment#2 is a medium-sized comparftnent made of waterproof material to house the charging station and the chmging port. It can house small items such as cell phones and keys. Compartment#3 is a larger comparfinent ofthe Backpack (Book bag) that can house notebook pads and folders. Compartment#4 is a larger and wider compartnent than comparhnent#3, which can house several large books. Compartment #5 has a 360-degree zipper so it can completely detach itself from the base. Once detached from the base, Comparhnent #5 allows the customer to separate the Backpack (Book bag) from the desk/table for easier comfort when working on the work desk. But the customer doesn't have to completely detach Compartrnen#4 from the base to utilize the desktop. The desktop base portion- The base portion is the comparhent that rests on the customer's back and will have the arm/shoulder silaps and where the adjustable table leg is housed. This comparhent will be made of material on the outside but standard hard "Desktop" material on the inside. This comparffient will house the retractable tabletop for the expansion of the Portable Desk workstation. The advanced Laptop Carrying Case workstation (desk) will feature two slidable holding clamp to secure laptops' onto the workstation (desk). Located on the Base Portion of the Laptop Carrying Case users can slide the left and right clamps outwards, then place their laptop in the center of the clamps, then slide the clarnps inwards to close the clamps and secure their laptop onto the workstation (desk). To remove their laptop from the clarnps, the user simply reveres their steps to secure their laptop. The Laptop Carrying Case workstation (desk) will also feature an electrical housing unit with a 15 AMP AC electrical outlet so users can recharge tleir laptops. The portable desk Laptop Carrying Case will have four (4) compartments. Compartment #1 (the base) is the comparffient where the adjustable legs are housed. This compartrnent will be made like standard Laptop Carrying Cases, except for the housing units on its bottom forthe extendable legs. It will also house on its desktop the two slidable clarnps, the two USB charging ports, the rechargeable battery, and the 15v AC outlet. Compartment #2 will be made of all materials and used to house the customer's laptop. Compartment #3 will be made of all materials and used to house notebook pads, reports, and waist and shoulder sftaps. Compartment ##4 will be made of waterproof material and used to house small items like pens, pencils, a calculator, keys, charger wires, phones, and other small items. The advanced portable workstation Briefcase will have an extendable workstation top surface ttrat can extend down on the left, the right, and the front sidewalls to create a larger workstation top surface to suit customers' needs and comfort. The dimensions of The Portable Workstation Briefcase related to its length and width will be 17in. by 19in. respectively and can be extended out via extendable right and left sidewalls to 23in by 25 in length and width. A fust pair of extendable and retractable workstation top LEFT sidewalls, a second pair of extendable and refactable workstation top RIGHT sidewalls, and a third pair of extendable and retractable workstation top FRONT sidewalls beins hingedly connected to the Briefcase body; a REAR WALL, when unzippe4 exposes 166 single telescopic leg, a single telescopic leg having a locking mechanism able to lock the telescopic leg at heights over 3 feet, and a telescopic (extendable and retractable) leg can be extended out to reach over three feet in height. The portable workstation Briefcase will have only one comparhent. This compartrnent will be waterproof material/leather on the exterior but made of standard "Workslation" material on the inside bottom section. The Briefcase will have a combination lock on the outside and be shaped in a square. BRIEF DESCRIPTION OF THE DRAWINGS Various exarnples of objects, features, and intendant advantages ofthe present invention will become fully appreciated as the same becomes better understood when considered in coniunction with the accompanying drawing, in which, like reference, characters, designate the sarne or similar parts throughout the several views. To illustate the invention, there are shown in the drawings forms which are presently preferred; it is understood, however, that this invention is Nor limited to the precise arangements and instrumentalities shown. FIG.1 shows a front view of a Backpack (Book bag) showing my design and establishing the term and location of the "Front Face" of the Backpack (Book bag); , the parts in dotted lines form NO part of the claimed desrgn, thereof FIG.2 shows a front view of the REAR FACE and the REAR WALL of a Backpack (Book bag) telescopic leg housing unit. The housing unit can be revealed by simply unzipping a zipper on the REAR WALL located on the rear face of the BASE Portion of the Backpack (Book bag) thereof; FIG.3 shows a front view of where a Backpack (Book bag)'s FOLDABLE CHAIR is housed in the Backpack (Book bag) located inthe rear face of a Backpack (Book bag) thereof; FIG.4 shows a front view of a Backpack (Book bag)'s FOLDABLE CHAIR removed from its housing unit in the Backpack (Book bag) and folded out thereof; FIG.5 shows a front view of the rear face of a Backpack (Book bag) where a telescopic leg can be revealed by simply unzipping the REAR WALL on the rear face of the Backpack (Book bag) thereof; FIG.6 shows a front view of the rear face of a Backpack (Book bag) with the telescopic (extendable and retactable) leg extended doram that can reach over three feet in height, where one or more Bluetooth speakers, a voice-activated-digital assistant application, and one or more retractable wheels oa the bottom of the telescopic leg are housed thereof; FIG.7 shows a front and side view of a Backpack (Book bag) with the base portion of the Backpack (Book bag) being separated from the front portion of the Backpack (Book bag) via a 360-degree zipper thereof; FIG.8 shows an elevational view of a Backpack (Book bag) used as a desk when the single telescopic leg is extended down, a tablet computer on the front portion of the Backpack (Book bag), and establishing the term and location of the uFront Portion and "Base Portion" of the Backpack (Book bag) thereof; the parts in dotted lines formNO part of the claimed design, thereof; FIG.9 shows an elevational view of a Backpack (Book bag) with the desktop surface expanded out on the left sidewall and right sidewall of the Backpack (Book bag) to create a larger desktop surface thereof; FIG. 10 shows a front view of a Backpack (Book bag) with the base portion of a Backpack (Book bag) separated from the front portion, the telescopic leg lowered, and the portable chair separated from the base portion of the Backpack (Book bag) to convert into a desk and chair used by a child and where the phone holder is housed when not utilized, the parts in dotted lines form NO part ofthe claimed design, thereof; FIG.11 shows a side view of a Backpack (Book bag) being used while standing via a telescopic leg and the detachable shoulder straps being detached so the shoulder staps don't interfere with the desktop being fully utilize4 the parts in dotted lines form N0 part of the claimed design. thereof; FIG.12 shows a front view of a Backpack (Book bag) and how the PORTABLE USB charging port is utilized, the parts in dotted lines forrn NO part of the claimed design, thereof; FIG.13 shows a front view of a Backpack (Book bag)'s carrying handle and wheels, the parts in dotted lines form NO part of the claimed design, thereof; FIG.14 shows a front view of a Laptop Carrying Case showing my design and establishing the term and location of the "Front Face" of the Laptop Carrying Case: FIG.15 shows a front view of where a Laptop Carrying Case's FOLDABLE CHAIR is housed in the Laptop Carrying Case located in the rear face of a Laptop Carrying Case thereof; FIG.16 shows a front view of a Laptop Carrying Case's FOLDABLE CHAIR removed from its housing unit in the Laptop Carrying Case and folded out thereof; FIG.17 shows a front view of the rear face of a Laptop Carrying Case with the telescopic (extendable and retractable) leg extended down where one or more Bluetooth speakers, a voice- activated-digital assistant application, and one or more retractable wheels on the bottom of the telescopic leg and the knob to extend and reffact the telescopic leg are housed thereof; FIG.18 shows an elevational view of a Laptop Carrying Case with the laptop holding clamps, and the refractable electrical housing unit is lowered into its housing unit thereof; trIG.19 shows an elevational view of a Laptop Carrying Case with a laptop being secured onto ths Laptop Carrying Case via a holding clamp, and the retractable electrical housing unit is retracted up from its housing unit. The electical housing unit housing two USB ports, a 15 AMMP AC outlet and the bxtery recharging port, the parts in dotted lines forms NO part of the claimed design, thereof; FIG.20 shows a front view of a Laptop Carrying Case with the telescopic leg lowered on the rear face and used as a workstation (desk). The phone holder and the electrical housing unit are utilized; the parts in dotted lines formNO pmt ofthe claimed design" thereof; FIG.21 shows an elevational view of a Laptop Carrying Case with a cup holder that can be extended out via a push button and utilized; the parts in dotted lines forrr NO part of the claimed design, thereof; FIG.22 shows a front view of a briefcase showing my design and establishing the term and location of the "Front Face" of the Briefcase: FIG.23 shows a front view of where a Briefcase's FOLDABLE CHAIR is housed in the Briefcase located in the rear face of a Briefcase thereof; FIG.24 shows a front view of a Briefcase's FOLDABLE CHAIR removed from its housing unit in the Briefcase and folded out thereot FIG.25 shows a front view of the rear face of a Briefcase with the telescopic (extendable and retactable) leg extended down where one or more Bluetooth speakers, a voice-activated-digital assistgnt application, one or more retractable wheels on the bottom of the telescopic leg, and the knob to extend and retract the telescopic leg are housed thereof; FIG.26 shows a front view of a briefcase with the telescopic leg lowered on the rear face, and the left sidewall, right sidewall, and front sidewall me in their original position. FIG. 27 shows an elevational view of a Briefcase with a cup holder and a phone holder in its original position thereof; , the parts in dotted lines form NO part of the claimed design, thereof; FIG.28 shows an elevational view of a Briefcase rechargeable battery being recharged and one of the two USB ports being used to charge a phone, the parts in dotted lines form No part of the claimed design, thereof; FIG.29 shows an elevational view of a Briefcase with a cup holder flipped up and utilized and a phone holder utilized, and a tablet computer, the parts in dotted lines form NO part of the claimed design, thereof; FIG.30 shows a front view of a briefcase's carrying handle and wheels; the parts in dotted lines forrr NO part of the claimed design, thereof; FIG.31 shows an elevational view of a backpack (Book bag) disassembled thereof; FIG.32 shows an elevational view of a Laptop Carrying Case disassembled thereof; FIG.33 shows an elevational view of a Briefcase disassembled thereof; the parts in dotted lines form NO part of the claimed design, thereof; DETAILED DESCRIPTION This invention concems a Backpack (Book bag), Laptop Carrying Case, and a Briefcase that can be converted into a workstation (desk) vla a single telescopic leg so ttrat, in addition to being usabte for conventional Backpack (Book bag), Laptop Carrying Case and a Briefcase usage; i.e., for books, notebook pads, laptops, and supplies, it can be used for a single leg supported workstation (desk) which conventional (Bookbag), Laptop Carrying Case and a Briefcase are not usually applicable, thereby renderiog my (Book bag), Laptop carrying case and a Briefcase much more useful and versatile than a conventional convertible (Book bag), Laptop Carrying Case and a Briefcase. With respect to the below description, it is to be realized that the optimum dimensional relationship for the parts of the invention (especially the telescopic leg) includes variations in size, materials, SHAPE, form, function, and manner of operation. Assembly and use are deemed readily apparent and obvious to one skilled in the art. All equivalent relationships to those illustrakd in the drawiag and described in the specifications are intended to be encompassed as the present invention. Also, while the present invention is susceptible to embodiment in various forms, there is shown in the drawings and will hereinafter be described as a presently prefened embodiment with the understanding that the present disclosure is to be considered an exemplification of the invention and is not intended to limit the inventioa to the specific embodiment illustated. In an embodiment of the disclosed technology, a Backpack (Book bag) convertible to a workstation (desk) comprises a SINGLE TELESCOPIC (extendable and retactable) LEG FIG.6 that is attached to the Base Portion (REAR FACE) of the Backpack (Book bag) FIG.5 used to create a workstiation (desk) FIG.9; NOTE: The terrn "REAR FACE' as it relates to the location on the Backpack (Book bag) should NOT be confused with the term "BOTTOM " of the Backpack (Book bag) as they are in tr,rro TOTALLY different locations. The "bottom" of the Backpack (Book bag) is where the wheels are located FIG.13, member 40. Reference is now made to FIG.10 which is a perspective view illustration of two alternative uses of the Backpack (Book bag). In some embodiments, the Front Portion of the Backpack (Book bag) may be completely removable from the Base Portion FIG.7 and used as a conventional Backpack (Book bag) FIG.10, member 10, Conversely, the Base Portion of the Backpack (Book bag) being partially or fully removable from the Front Portion of the Backpack (Book bag) can be used as a workstation (desk) FIG.10, member 61, enabling altemative usage for the Backpack (Book bag) once detached. Users can use the base portion of the Backpack (Book bag) as a workstation (desk) FIG.10, member 61, to complete school and job-related tasks and an outdoor dirring table for hikers. Once the base portion is detached from the Backpack (Book bag), the Front Portion can still be conveniently carried viathe carrying handle FIG.10, member 10 that's on the Backpack (Book bag). The advanced Backpack (Book bag) has a waterproof exterior comparurent FIG.1, member 1, to house the PORTABLE USB charging station. A zipper that can unzip 360 degrees FIG.1, member 5 so the Backpack (Book bag)'s Front Ponion can be separated from its Base Portion FrG.7 once separated, the Base Portion can be used as a workstration (desk) x.IG.10. The advanced Backpack (Book bag) FIG.1 could be essentially, BUT NOT LIMITED to being oval in shape and size copiously to house a wide array of personal, business, and school-related items. The Backpack (Book bag) FIG.1 will preferably be similar in appearance to a standard Backpack (Book bag) and could be produced using preferably constructed of a dr.rable, lightweight, and flexible woven or non-woven fabric material such as nylon (e.g., Codura ^TM , rip-stop), cotton, polyester pack-cloth, PVC, reinforced, waterproof textile material such as durable and breathable Gore-Tex. Positioned on the back of the Backpack (Book bag), FIG.1 will preferably be two adjustable shoulder straps, member 7 designed for easy transport with adjustable sfraps member 8 to accommodate each user's body type and offer resistance comfort. Turning to FIG.1, the Backpack (Book bag) will feature a carry handle member 10, a water bottle housing unit member 11, and three zippers member 2, 3, and 4 for access into compartnents number 1, 3, and 4, respectively. In an embodiment of the disclosed technology, a Backpack (Book bag) comprises a locking mechanism to keep the telescopic leg locked at the user's desired height FIG.8, member14, an oval-shaped leg base to ensure sturdiness on all floor surfaces member 61. The Advanced Backpack (Book bag) has a hard desklop surface FIG.8, member 12 on the BASE PORTION with a pencil holder FIG.8, member 17 to put the user's rlmiting tool so it can be easily accessible to the user. In an embodiment of the disclosed technology, a Backpack (Book bag) comprises an LCD Tablet Computer FIG.8, member 16 on the Backpack (Book bag)'s Front Portion. The tablet computer is a touch screen and Bluetooth. The user can use the tablet computer for video conferences, watching videos, movie steaming sites, and any other usages for a Tablet computer. The Tablet computer will be designed to function the same as conventional Tablet computers, Samsung Galaxy Tab, Microsoft Surface, Apple iPod, and other brands. Reference is now additionally made to FIG.1 a perspective view illustration of the convertible Backpack (Book bag) used as a workstation (desk) when the Backpack (Book bag) Front Portion is connected to the Base Portion FIG.8. Reference is made to FIG.1 which will have five compartuents. Compartment#1, FIG. 1, member 2 is the smallest comparfuent used to house pens, pencils, small note pads, make-up, and a calculator. Compartment#2, FIG.1, member 1 is a medium-size comparhrent made of waterproof material and is used to house the PORTABLE USB port to charge electrical devices like cell phones. It can house small items such as cell phones and keys. Compartment#3, FIG.1, member 43, is a larger compartnent of the bag that can be used to house notebook pads and folders. Compartment#4, FIG.1, member 44 is a larger and wider compartment than compartment#3, which can house large books. Compartment#s, FIG.1, member 45, has a 360degree zipper member five to completely detach itself from the Base. Once detached from the base portion, Comparffirent #5 allows the customer to separate the Backpack (Book bag) from the desk/table for easier comfort when working on the work desk. But the customer does not have to completely detach Compartment#4 from the base to utilize the desktop FIG.8. In an embodiment of the disclosed technology, a Backpack (Book bag) comprises a detachable shoulder strap FIG.2, member 9 male clips, and a female clip member92, so the shoulder shap does not interfere with the fuIl usage of the desktop. To detach the shoulder staps, the user needs only to unfasten the male clip from the female clip FIG.8. Reference is now additionally made to a specially designed single telescopic leg housing unit on the Rear Face of the Portable Backpack (Book bag), which is openable to expose a SINGLE telescoping (extendable and retractable) leg FIG.5n member 75, whichNO other Backpack (Book bag) has. The single telescopic leg will be hidden behind the REAR WALL FIG.2, member 75, until the user unzips member 71 the REAR WALL to expose the single telescopic leg. The SINGLE telescoping (extendable and retactable) legs FIG.5, member 13, enables the Backpack (Book bag) to be converted into a table usable as a workstation (desk) FIG.10. Reference is now additionally made to the knob for locking and unlocking the telescopic leg into its housing unit knob FIG.6, member 23, located on the rear face of the Backpack (Book bag). The knob is used to unlock and lock back into position the telescopic leg into its housing unit and extend and retact the telescoping leg. This may be done by turning the locking knob FIG.5, member 23 clockwise and then extending the knob down. To retract the telescopic leg, the user only oeeds to push the knob up to retact the telescopic leg up into its housing unit and tum the locking knob counter-clockwise to lock the leg back into its housing unit. Reference is now made to the Backpack (Book bag) FIG.6, member 13 SINGLE telescopic leg shape. The shape of the telescopic leg could be essentially, BUT NOT LIMITED to being, oval. Other shapes can be, BUT ARE NOT LIMITED to being, squaro, triangle, circular, and rectangle. In an embodiment of the disclosed technology, the Backpack (Book bag) has two Bluetooth speakers FIG.5, member 73, located on the Rear Face of the Backpack (Book bag) mounted onto the top portion of the telescopic leg and can be used for listening to music and hands-free phone calling. In some embodiments, the speakers on the telescopic Leg FIG.6, member Tsrltave a voice-activated digital assistant application similar to Siri and Alexa. Users can ask and receive answers to their questions. Reference is now additionally made to FIG.6. which is a perspective view illustation of the convertible Backpack (Book bag) telescopic leg having wheels FIG.6, member 74, connected to the bouom (base portion) ofthe telescopic leg adapted for rolling the Backpack (Book bag) on a floor surface for easy on when used as a workstation (desk). The wheels on the telescopic leg are reftactable, whereas the user only needs to push the wheel into its housing unit to release them out. When done, the user snaps the wheels back into their housing unit the same way the cup holder is utilized. The bottom/base of the telescopic (extendable and rehactable) leg will be but not limited to being oval-shaped to ensure sturdiness on all floor surfaces In an embodiment of the disclosed technology, the Backpack (Book bag) has a phone holder FIG.10, member 94, so users can work on their assignments while speaking on the phong hands-free. The phone, as illusfrated in FIG. l0r lays flush on the side of the Backpack (Book bag), and the user needs only to lift the phone holder up for usage by placing their phone into the phone's adjustable holding clamp. Reference is now made to the desktop surface being extendable. The Advanced Backpack (Book bag) desktop surface can be extacted to create a larger desktop surface FIG.9. The user would simply extend out the left sidewall FIG. 9n member 26,and,the right sidewall FIG.9, member 27 viaa slidable mechanism. The desktop surface can be retracted back to its original dimensions when the left sidewall FIG.9, member 26randthe right sidewall FIG. g, uember 27 are retracted by pushing those inwards toward the Backpack (Book bag). In some embodiments, the Base Portion of the Backpack (Book bag) may include a sliding mechanism for the right side wall and the left side wall located on the left and right side of the Backpack (Book bag), respectively, which may be used, when deployed, to support the extension of the workstation top surface into a lager workstation top surface FIG.9, member 26 and27 respectively thereby enabling the user to use the workstation top surface more conveniently and comfortably. The user needs to slide the left sidewall and the right sidewall out in opposite directions to extend the workstation's top surface. The left sidewall and right sidewall are all flush with one another when the Backpack (Book bag) workstation top surface is extended. Reference is now made to FIG.10 and FIG.6, which are perspective view illustations ofthe detachable shoulder strap. FIG.10 member 9 and FIG.6, member 9 and 92, according to a further embodiment of the disclosed technology, illusrates the usage of the detachable shoulder straps. As seen in FIG.10 member 9, the male shoulder sfiraps clamp is not inserted into the female clamp as in FIG.6, membere 9, and 92, this allows the user to firlly use the workstation (desk) free ofthe shoulder stap interference FIG.10. The Advanced Backpack (Book bag) is designed to be used by children FIG.10 and adults FIG.11. In the operative orientatioru the Backpack (Book bag) functions as a workstation (desk), disposed at a suitable height for the user to work comfortably and conveniently, even when "on - the - go." Reference is now made to FIG.11, a perspective view illusffition of telescoping legs having a locking mechanism member 14. The telescopic leg can lock at a minimum height for kids and short height users to heights over three feet for taller users and users who desire to use their Backpack (Book bag) as a workstation (desk) while standing member 14. In some embodiments, the telescopic FIG. llo member 14 includes a mechanism to lock the leg at the desired height of the user on a floor surface to prevent unintentional reffaption of the legs. The single telescopic leg FIG.11 can extend to reach heights over three feet tall for taller users and users standing up. Reference is now made to the Advanced Backpack (Book bag) cup holder FIG.11, member 24.The Advanced Backpack (Book bag)'s cup holder is not visible FIG.1, member 24. The user needs to push in the cup holder's front face inwards to extend the cup holder out and once fully out, the user needs only to push the cup holder into its housing unit to lock it back into its housing unit. Once extended from its housing slot, the urcr can have the convenience of using the cup holdEr FIG.11, member 24rto secure their beverage. In an embodiment of the disclosed technology, the Advanced Backpack (Book bag) will advance Backpack (Book bag)s as it contains aot one but TWO PORTABLE USB charging stations FIG.12 member 38 and 39 and a rechargeable battery/charqing port FIG.12 member 37. All other backpackybook bags with built-in charging stations only have ONE PORTABLE USB charging station, whrereas the Advanced Backpack (Book bag) will house 2 charging PORTABLE USB ports FIG.12 members 38 and 39. This will allow the user to charge 2 devices, their phone, Tablet computer, and other electronic devices, simultaneously and safely as comparftnent #2 FIG.1, momber I, will be waterproof in a 360 circumference. The Advanced Backpack (Book bag) will also house a charging port for recharging the charging device FIG.12 member 37, whereas the user can recharge the charging port from their home electrical outlet. In the embodiment ilustrated in FIG.13, an additional cover includes a palr of wheels on the BOTTOM of the Backpack (Book bag) member 40 for easy transportation on all surfaces, a carry handle member 42, and a retractable amo member 41, to conveniently travel with the Backpack (Book bag) while using the wheels ou the BOTTOM of the Backpack (Book bae). Reference is now made to FIG.3, the chair. The Advanced Backpack (Book bag) has a portable folding chair FIG.3, members 79 & 80 that can be removed from the Backpack (Book bag)'s rear face FIG.4 so the users can sit down while working at the portable desk at any location FIG. f0 The user simply needs to remove the seat from the Base Portion of the Backpack (Book bag) FIG.3, member 79, then unfold the legs member 80 on the chair and sit down FIG.10. In some designs, the chair can be sewn to the Rear Face of the Backpack (Book bag) via a 360- degree apper where the user simple unzips the base of the chair Member 80 from around the circumference of the lower part of the Base Portion of the Backpack (Book bag) to remove the chair from the Backpack (Book bag). Generally speaking, the Advanced Laptop Carrying Case FIG.14 comprises a specially designed modified carrying bag system that features an Advanced Laptop Carrying Case consisting of a SINGLE TELESCOPIC (extendable and retractable) LEG FIG.17 member 8 attached to the REAR FACE FIG. 17 ofthe Laptop Carrying Cases used to create a desk FIG. 20, member 8. The advanced Laptop Carrying Case FIG.14 will preferably be similar in appearance to a standard Laptop Carrying Case and could be produced using preferably constructed of a durable, lightweighL ana flexible woven or non-woven fabric material such as nylon (e.g., Codura ^TM , rip-stop), cotton, polyester pack-cloth, PVC, reinforced, waterproof textile material such as durable and breathable Gore-Tex, Flux Leather and Genuine leather and has a dimension of 2in by 16in. ln an embodiment of the disclosed technology, the Laptop Carrying Case FIG.14 will have 4 compartrnents. Comparffient #l member I will be made of waterproof material and used to house pens, pencils, calculators, keys, charger wires, phones, and anything that can fit in it. Compartment#2 will be made of waterproof material and used to house notebook pads, reports, and shoulder staps. Compartment #3 houses the two CLAMPS FIG.18 used to secure the customer's laptop on the workstation members 58 & 59, the ELECTRICAL HOUSING LrNIT member 34 thathouses the AC OUTLET member 37 used to recharge the ussr's laptop when the male plug of the laptop power cord is plugged into the Laptop Canying Case's AC outlet, TWO USB charging station members 35 & 36 and the power source to recharge the electical housing unit member 55. Comparmen#4 (the bottom/base portion) trIG.17, member 76 houses the single telescopic leg. The Advanced Laptop Carrying Case can be transformed into a work desk FIG.19 when FIG. 17, member 76 is ,tnojpped and folded back FIG. 17, member 38. Reference is now additionally made to a knob on the rear face FIG.17, member 23 used to unlock and lock back into position the telescopic leg into its housing unit. Extending the telescoping leg may be done by turning the locking knob tr"IG. 17, member 23 clockwise and then extending the knob down. To reilact the telescopic leg, the user only needs to push the knob up to retact the telescopic leg into its housing unit and turn the locking knob counter- clockwise to lock the leg into its housing unit. Reference is now made to the Laptop Carrying Case SINGLE telescopic leg shape FIG. 17, member 8, located on the Rear Face of the Laptop Carrying Case. The shape of the telescopic leg could be essentially, BUT NOT LIMITED to being, oval. Other shapes can be BUT ARE NOT LIMITED to being, square, triangle, circular, and rectangle. In an embodiment of the disclosed technology, the telescopic leg has two Bluetooth speakers, FIG.17, member 73, mounted on its top part, which protects the speakers from the weather and is used for listening to music and hands-free phone calls. In some embodiments, the speakers on the telescopic Leg FIG.17, member 73,bave a voice-activated digital assistant application similar to Siri and Alexa. Users can ask and receive answers to their questions. Reference is now additionally made to member 74, a perspective view illustation ofthe convertible Laptop Carrying Case telescopic leg having wheels connected to its bottom (base portion) adapted for rolling the Laptop Carrying Case on a floor surface for easy transportation when used as a workstation. The urheels on the telescopic leg are retractable, whereas the user only needs to the wheels into its housing unit to release them out. When done, the user snaps the wheels back into their housing unit the same way the cup holder is utilized. The bottom/base of the telescopic (extendable and retractable) leg will be but not limited to being oval-shaped to ensure sturdiness on all floor surfaces ln an embodiment of the disclosed technology, a Laptop Carrying Case FIG.17 comprises, a single telescopic leg housed on the Rear Face of the Portable Laptop Carrying Case, which is openable to expose a SINGLE telescoping (extendable and retractable) leg member 8, whichNO other Laptop Carrying Case has. The single telescopic leg will be hidden FIG.17 until the user unzips member 76 andthe REAR WALL member 38 to expose the single telescopic leg hidden behind the rear wall, which is openable to expose a SINGLE telescoping (extendable and retractable) legs FIG.17, member 8, wtrich enables the Laptop Carrying Case to be converted into a table usable as a workstation (desk). In an embodiment of the disclosed technology, the Laptop Carrying Case has a phone holder FIG.20, member 94, so users can work on their assignments while speaking on the phone, hands-free. The phone holder lays flush on the side of the Laptop Carrying Case, and the user needs only to lift the phone holder for usage by placing their phone into the phone's adjustable holding clamp. Reference is now made to FIG.15 & FIG.16, the chair. The Advanced Laptop Carrying Case has portable folding chair members 79 &80 that can be removed from the Laptop Carrying Case's rear face FIG.15 so the users can sit down wtrile working at the portable desk at any location. The user simply needs to remove the chair &om the Base Portion of the Laptop Carrying Case FIG.21, unfold the legs member 79 onthe chair and sit down member 80. In some designs, the chair can be sewn to the Rear Wall of the Laptop Carrying Case via a 360- degree zipper where the user simple unzips the base of the chair FIG.16, Member 80 from around the circumference of the lower part of the Base Portion of the Laptop Carrying Case to remove the chair from the Laptop Carrying Case. ln an embodiment of the disclosed technology, the Laptop Carrying Case features a holding clamp to secure the laptop onto the workstation (desk) FIG.19 members 58 & 59. The Laptop Carrying Case workstation (desk) will feature a slidable clamp on the Base Portion of the Laptop Carrying Case where the users can slide the left and right clamps outwards, then place their laptop in the center of the clamps, then slide the clamps inwards to close the clamps and secure their laptop onto the workstation (desk). To remove their laptop from the clamps, the user simply reveres their steps to secure their laptop. Reference is now made to the Advanced Laptop Carrying Case cup holder FIG.19 member 18 and Fig.21 member 18. The Advanced Laptop Carrying Case's cup holder is not visible FIG.19, member 18. The user needs to push the cup holder's front face inwards to extend the holder out Fig.21 member 18. Once fully ou! the user needs only to push the cup holder into its housing rmit to lock it back into the housing unit. Once extended from its housing slot, the user can have the convenience of using the cup holder Fig.21, member 18. ln an embodiment of the disclosed technology, the Advanced Laptop Carrying Case has an electical housing unit Fig.18, member 34. The electical housing unit will house a 15 AMP AC electrical outlet Fig. 18, member37, TWO PORTABLE USB charging stations members 36 and 35, and a charqing port member 55 used to recharge the electical housing unit whereas the user can recharge the charging port from their home electical outlet. In the operative orientation the Laptop Carrying Case fi,rnctions as a workstation desk, disposed at a suitable height for the user to work comfortably and conveniently, even when "on - the - go." Reference is now made to Big.19, which is a perspective view illustration of telescoping legs made to lock at heights from a minimum height for kids and short height users to heights over tlree feet for taller users and users who desire to use their Laptop Carrying Case as a workstation (desk) while standing. In some embodiments, the telescopic Fig.19, member 9, includes a mechanism to lock the leg at the desired height of the user on a floor surface to prevent unintentional retaction of the legs. The single telescopic leg member I can extend out to reach heights over three feet tall for taller users and users standing up. Generally speaking, the convertible Briefcase Fig.22 comprises a specially designed modified briefcase that is convertible into a workstation consisting of a SINGLE TELESCOPIC (extendable and retractable) LEG; Fig.25 attached Base Portion member 14 located in the REAR FACE X'ig.25 of the Briefcase used to create a workstation Fig.26.The advanced briefcase waterproof exterior comparment Fig.22 will preferably be similar in appearaoce to a standard Briefcase having a handle FIG.22rmember 4, a combination lock on both sides of the top wall Fig.22, member 6, A button to open the Briefcase Fig.22, member 43, and A latch to open the Briefcase Fig.22, member 2 that will be securely fastened to the Briefcase via small bolts Fig.22, member3,43 and 44 respectively. Reference is now made to Fig. 22 andFig. 29, which are perspective view illustrations of truo alternative uses of the Briefoase where Fig.22 the Briefcase is being used as a conventional briefcase, and Fig.29 Briefcase is being used as a workstation (desk). According to embodiments of the disclosed technology, in some embodiments, the single telescopic leg, housed in&e Base Portion of the Briefcase, when extended down-converts the Base Portion of the Briefcase into a workstation Fig.27 emblingalternative usage for the Briefcase. The advanced Briefcase Fig.22 could be essentially, BUT NOT LIMITED to being, box-shaped but can also be squared or other shapes and sizes copiously to house a wide array of personal, business, and school-related items. The briefcase Fig.22 will preferably be similar in appearance to a standard briefcase and could be produced using preferably constucted of a durable, lightweight, and flexible woven or non-woven fabric material such as nylon (e.g., Codura t" , rip-stop), cotton, polyester pack-cloth, PVC, reinforced, waterproof textile material such as durable and breathable Gore-Tex. Reference is now additionally made to a specially designed single telescopic leg housed on the Rear Face Fig.25 of the Portable Briefcase, which is openable to expose a SINGLE telescoping (extendable and retractable) leg Fig.25, member 8, whichNO other briefcase has. The single telescopic leg will be hidden under the REAR WALL member 19 until the user unzips the rear walls zipper member 76 to expose the single telescopic leg hidden behind the rear wall, which is openable to expose a SINGLE telescoping (extendable and retractable) leg, which enable the Briefcase to be converted into a table usable as a workstation Fig.26. Reference is now additionally made to a knob on the rear face Fig.25, member 23 used to unlock and lock back into position the telescopic leg into its housing unit. Extending the telescoping leg may be done by tuming the locking knob Fig.25, member 23 clockwise and then extending the knob down. To retract the telescopic leg, the user only needs to push the knob up to retract the telescopic leg into its housing unit and turn the locking knob counter- clockwise to lock the leg into its housing unit. Reference is now made to the Briefcase SINGLE telescopic leg shape Fig.25, member 8. The shape of the telescopic leg could be essentially, BUT NOT LIMITED to being, oval. Other shapes can be BUT ARE NOT LIMITED to being, square, tiangle, circular, and rectangle. In an embodiment of the disclosed technology, the Briefcase has two Bluetooth speakers, member 73, located on the Rear Face of the Briefcase, mounted onto the top part of the telescopic leg, and used for listening to music and hands-free talking. In some embodiments, the telescopic Leg Fig.25, member 73, has a voice-activated digital assistant application similar to Siri and Alex4 where users can ask and receive answers to their questions. Reference is now additionally made to Fig.25. This is a perspective view illusfration of the convertible briefcase telescopic leg having wheels member 74, connected to the bottom (base portion) of the telescopic leg member21,and adapted forrolling the Briefcase on a floor surface easy transportation when used as a workstation. The wheels on the telescopic leg are retactable, whereas the user only needs to push the wheels into its housing unit to release them out. When done, the user soaps the wheels back into their housing unit the same way the cup holder is utilized. The bouom/base of the telescopic (extendable and retractable) leg will be but not limited to being oval-shaped to ensure sturdiness on all floor surfaces Reference is now made to Fig.23 and Fig.24, the chair. The Advanced Briefcase has portable folding chair members 79 &80 that can be removed from the Briefcase's rear face Fig. 23 so the users can sit down while working at the portable workstation at any location. The user simply needs to remove the seat from the Base Portion of the Briefcase FIG.Z4runfold the legs member 79 onthe chair, and sit down member 80. In some designs, the chair can be sewn to the Rear Face of the Briefcase via a 360-degree zrppex where the user simply unzips the chair's base Member 80 from around the circumference of the lower part of the Base Portion of the Briefcase to remove the chair from the Briefcase. In an embodiment of the disclosed technology, a briefcase comprises an LCD Tablet Computer Fig.29, member 23 on the Briefcase's Front Portion. The Tablet computer will be a touch screen and Bluetooth for video conferences, watching videos, movie steaming sites, and any other usage for a Tablet computer. The Tablet computer will be designed to function the same as conventional Tablet computers, Samsung Galary Tab, Microsoft Surface, Apple iPod, and othet brands. In an embodiment ofthe disclosed technology, the Briefcase has aphone holder Fig.29, member 94, so users can work on their assignments while speakiog on the phone, hands-fue. As illustrated in Fig.27,the phone lays curled up flush on the inside of the back wall of the Briefcase, and the user needs only to uncurl and then lift the phone holder up for usage by placing their phone into the phone's adjustable holding clanrp. Reference is now made to the Advaoced Briefcase cup holder Fig.27,member 41. The Advanced Briefcase's cup holder is not visible Fig,21rmember 41. To utilize the cup holder, the user only needs to flip up the cup holder Fig.29, member 41. Once extended up from its housing slot, the user can have the convenience of using the cup holder Fig.29, member 24. The Advanced Briefcase has a hard workstation top surface Fig.29, member 12 with this in mind reference is now made to Fig.29;the advanced briefcase workstation top surface can be extended down on three sides to create a larger workstation top surface. The user would simply lowerthe FRONT sidewall member 10, LEFT sidewall member 11, and RIGHT sidewall member 12 down which is hingedly attached to the briefcase assembly to create a workstation. The workstation's sidewalls can be rehacted back to their original dimensions when all three sidewalls are pushed inwards towards the Briefcase. The dimensions of the desktop of the Briefcase will be similarto conventional briefcase dimensions, 13in by 16.5 Big.27; however, when the left and right sidewalls are extended down to create a workstation, the advanced briefcase desktop dimensions will become 23 inches by 25 inches Fig.29as it relates to its length and width. In an embodiment of the disclosed technology, the Advanced Briefcase will advance briefcases as it contains not one but TWO PORTABLE USB charging stations Fig.28 members 17 and 19 and a rechargeable battery/charging port member 16. All other briefcases with built- in charging stations only have ONE PORTABLE USB charging station, whereas the Advanced Briefcase will house 2 charging PORTABLE USB ports. This will allow the user to charge their cell phone and a second electonic device simultaneously. The Advanced Briefcase will also house a PORTABLE USB charging port for recharging the charging device that powers the USB port. The user can recharge the charging port from an electrical outlet Fig.28 member 16. In the operative orientation, the briefcase functions as a workstation disposed at a suitable height for the user to work comfortably and conveniently, even when "on - the - go." With this in mind, reference is now made to Fig.29, which is a perspective view illustration of telescoping legs made to lock at heights from a minimum height of 6 inches to maximum heights of over three feet for taller users and users who desire to use their Briefcase as a workstation while standing. In an embodiment of the disclosed technology, a briefcase comprises a locking mechanism to keep the telescopic leg locked at the user's desired height Fig.29, member 8, and to prevent unintentioaal retraction of the legs. The oval-shaped leg base member 21 ensures sturdiness on alIfloor surfaces. The single telescopic leg member 8 can extend out to reach heights over three feet tall, also for taller users and users standing up. The telescopic leg is housed in a housing unit on the rear face of the base portion of the Briefcase Fig.25. In the embodiment illustrated includes a pair of wheels on the BOTTOM of the Briefcase Fig.30, member 37 for easy tansportation on all sur{aces, a carry handle member 39, and a retractable arm member 38, to conveniently travel with ttre Briefcase while using the wheels on the BOTTOM of the Briefcase. Reference is now made to FIG.31 a disassembled backpack (Book bag), FIG.32 a disassembled Laptop Carrying Case disassembled and FIG.33 a disassembled Briefcase. The foregoing is considered illustative only of the principle of the Portable Workstation Briefcase. Further, since numerous modifications and changes will readily occur to those skilled in the art, limitiog the invention to the exact eonstruction and opration shown and described is not desired. Accordingly, all zuitable modifications and equivalents may be resorted to, falling within the scope of the invention. The present invention may be embodied in other specific forms without departing from the spirit or essential atffibutes thereof. Accordingly, reference should be made to the appended claims rather than the foregoing specification indicating the invention's scope.