AENMIL Portable Tactical Military Army Style 3L Water Backpack Water Bladder Bag 600D Nylon Water Resistant Water Army Bag with Drinking Tube for Climbing with Small Pouches 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 Equipped with a tube with a bite valve to drink, so you don't need to hold it to drink Perfect to use when hiking, climbing, riding and other outdoor actives