The REI Co-op Trail Hydro 20L Hydration Pack is designed for hiking and camping. It is a lightweight backpack made of polyester and nylon, with a capacity of 1,220 cubic inches. The pack features a hydration bladder, divider system, ventilated back panel, padded straps, hip belt, external pockets, and an elastic pocket. It is in orange color and has a unisex design suitable for adults.