The topeak air backpack is especially designed for cyclists with its innovative super light design it uses pressurized air for fine tuning the backpack for an individual fit when deflated the cycling backpack packs down to a compact 13x24cm size for easy storage which makes it ideal for travelling an integrated micro pump and air release valve fold away into a compartment on the waist harness topeak air hydration backpack features compartments 2x main 2x side pockets 1x front pocket 1