Artone Large 48L Professional Hiking Mountaineering Hydration Backpacks with Rain Cover and Internal Frame Material: nylon. Water Resistant. Guard your belongings in the rainy weather. Size:13*9.1*26IN/ 33*23*66CM Weight:2.9LB/ 1.3KG Significantly lighten the burden on the shoulders by distracting weight to the waist ROOMY(48 Liter) Perfect for hiking,traveling,camping,cycling,mountaineering and trekking. Hydration Bladder pipe port provided. Convenient to Hydration Bladder water when cycling or mountaineering. Free your hands and No need to stop.