In order to keep up with your speed, you need a bag that's light-weight yet offers ultimate storage. Well, here it is. Built with every detail in mind, this backpack features a cut-out space for a hydration system, a barely-there feel, moisture-wicking materials, and a substantial amount of storage space. Features 65% Polyester, 35% nylon Zip opening into main compartment Elastic rope system on face for volume adjustment Dual mesh side pockets Large elasticated pocket and elastic loops for hydration system Adjustable shoulder straps with adjustable sternum strap and waist strap; Carry handle Moisture-wicking back and straps Reflective PUMA Cat Logo at front