PackMasters Hydration Pack with 2.5L Backpack Water Bladder and Adjustable shoulder Strap Hunting Climbing Running Hiking Outdoors Hydration Bladder Capacity: 2.5L; Size: 45 X 21cm; Net Weight: 460g(16.23oz) Two Layers cargo design, one for hydration bladder, and the other for extra carrying purpose. Equipped with a tube with a bite valve to drink, you do not have to hold it to drink. With a pouch on the back of the pack, you can carry your phone, keys and some small tools easily. Constructed by waterproof 600D high density Nylon material and with the high quality bladder, it can keep the water cool for hours.