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.;A switch on/off bite valve, convenient for control the flow of water.

• Andoer 3L Tpu Hydration System Bladder Water Bag Pouch Backpack Hiking Climbing, Black

Andoer 3L Tpu Hydration System Bladder Water Bag Pouch Backpack Hiking Climbing, Blackieasycan