No one s got your back like AIRBAC. Feels Like You re Carrying Half The Weight G€" Our AIRBAC patented air support system allows the weight in the backpack to rest comfortably just above the waistline, to literally take the weight off your back and shoulders. You ll feel the difference immediately! The Wander features the AirBac Patented Technology support system that adjusts to your body's shape and alleviates weight load pressure to provide maxium comfort, contoured shoulder straps ergonomically designed with added padding for comfort and control, and an interior pocket designed to provide organization for pens/pencils, CDs, wallets, and note pads. It also comes with an interior cellphone pocket that fits most popular phones and exterior elasticized mesh water bottle pockets. Materials: Nylon. Dimensions: 28"L x 9"W x 12"H Weight: 2.5 lbs.