Fashion Outlet 3L Hydration System Water Bag Pouch Backpack Bladder Hiking Climbing Survival Black/ Camouflage Constructed by waterproof 600D high density Nylon material. Two layers cargo design, one for hydration bladder, and the other for extra carrying purpose. Adjustable shoulder strap and chest belt, suitable for heavy carrying. Perfect to use when hiking, climbing, riding and other outdoor actives. Hydration Bladder Capacity: 3L