Medium AirPacks Backpack 2000-cubic-inch capacity, fits individuals 5’-5’5" tall or who measure 15" to 17" from the top of the shoulder to the natural waist. Patented air technology reduces stress on back by up to 80%, lightens effective load by 50%. Transfers weight from shoulders to lower back for revolutionary comfort and support. Recommended by the Congress of State Chiropractic Associations.

Physicians recommend that students carry no more than 15% of their body weight on their shoulders and backs, yet studies show they are lugging as much as 40% each day. Recommended by the Congress of Chiropractic State Associations and developed with orthopedic professionals, the unique AirPack System, has been university tested and clinically proven to help students tote today's loads more safely and comfortably. Our patented, ergonomic air-transfer system, with its inflatable lumbar cushion and wide shoulder straps, redistributes weight from the shoulders to the hips and lower back to promote an upright standing position and enhance the body's natural ability to carry weight. Smart design features include: shoulder straps that automatically adjust side-to-side to help maintain correct ergonomic support, even when using just one strap; adjustable strapping for even more customized fit, three convenient zipper compartments that help organize books, pens, and other necessities (even a handy key keeper), and two mesh bottle pockets. Made of durable polyester in a variety of popular colors. 18.5" x 12" x 8.5". Capacity: 2000 cubic inches. Mini air pump included. The Medium fits average-sized middle school or high school students and smaller college students or adults who are 5’to 5’5" tall or measure between 15" and 17" from the top of the shoulder to the natural waist (persons taller than 5’5” or 17+ might consider the Large). Measure first, get the right size and enjoy AirPacks relief soon.