The Small #3300 is an ideal AirPack Backpack for a smaller elementary school student. It's also perfect for a petite middle or high school student or adult who is shorter than 5' or whose body measures 15" or less from the top of the shoulder to the natural waist.Although physicians recommend that students carry no more than 15% of their body weight on their shoulders and backs, studies show that younger students are lugging as much as 40% each day. The AirPack Backpack's inflatable cushion helps reduce back stress by acting as a fulcrum to redistribute weight from the shoulders to the hips.The standard ergonomic design features a patented lumbar air cushion; wide, foam-cushioned shoulder straps; and adjustable top and bottom straps that automatically adjust side-to-side to help maintain correct ergonomic support. Additional features include a padded haul handle; a large interior compartment for heavier books and other necessities; a large front pocket with organizer for notebooks, pens and pencils (including a handy key keeper, CD player pocket and headphone port); a front zipper pocket; two mesh side bottle pockets and a new detachable cell phone/mp3 holder.AirPack Backpacks are made of durable Poly Oxford 600-denier material. The pack comes in a variety of popular colors. Dimensions are 16.5" x 12" x 7" (42 cm x 30 cm x 18 cm), with a capacity of 1,650 cubic-inches. A mini air pump is included. Care Instructions: Hand wash with mild soap or wipe with damp wash cloth.Air drying and machine washing and drying are not recommended.

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 Chiropractic State Associations.

Provides 1650-cubic-inch capacity.

Fits students shorter than 5' or 15" or less from the top of the shoulder to the natural waist.