OUTERDO Water Bladder Bag Hydration for Cycling Camping Hiking Climbing 1/1.5/2.5/3L 1. Safety non-toxic environment. 2. Compressive resistance to abrasion. 3. Tube connected to the bottom of the bladder 4. Can be put into backpack and backpack 5. Can be used to store water with -20 to 40degree celsius