Foldable design water bladder Not included;2 side storage compartment for keys, phone, snacks etc;Can be used to store water with -20 to 40degree celsius

• Multi-Color Hydration Pack Water Rucksack Backpack Bladder Bag Cycling Bicycle Bike/Hiking Climbing Pouch(Hydration Bladder NOT Included)

Multi-Color Hydration Pack Water Rucksack Backpack Bladder Bag Cycling Bicycle Bike/Hiking Climbing Pouch(Hydration Bladder NOT Included)ieasycan