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