Pinty 2L Hiking Backpack Hydration Pack with Water Bladder Cycling Climbing Camping Bag (Black/Pink/Green/Blue/Orange/Red) Back Pack: Made of durable nylon fabric: Resistant to abrasion, wear and tear Back Pack: Two layers design: one for the liquid container, and the other for keys, phones etc. Back Pack: Wide webbed shoulder straps with holes for the water tube Water Bag: Stores water from 68F to 104F (20C-40C) Water Bag: Made of non-toxic, environmentally friendly material