Banner Bonnie Hydration Pack Water Rucksack Backpack Bladder Bag Cycling Bicycle Bike/Hiking Climbing Pouch + 2L Hydration Bladder Multi-function Backpack bag with 2L Bladder Nylon Waterproof material. Breathable Mesh Belts & Backpad. Adjustable Elastic band to put the helmet in. 4 Reflective Tapes to keep you safe during evening cycling Can be used to store water with -20 to 40 degree celsius