Sunature 20l Cycling Hydration Packs 9604 nylon Imported Powerful Bear Breathable System, the heat could quickly spread out, avoiding the embarrassment of sweat, also it's more comfortable for your back Supwer professional adjustable weight decompsition sytem, rainproof design 3 pocket, 2 side pocket, a rain cover in bottom, a cellphone pocket in shoulder strap, Safety Belt-carrying back system uses specially thickened waist made of sponge, while better protecting your waist, your weight decomposition in travel, and it the waist band covered with mesh, it's more comfortable for your pack Material: High qualit waterproof nylon&Textile Size: 20.5x12.6x7.9inch