Features Large capacity of 40L-60L,Breathable S-type strap,mesk belt,Outside with D-type fasteners Large front pocket, multiple zippered side pockets, and multiple elastic bands, inside including a Laptop layer Supwer carrying-TCS professional adjustable weight decompsition sytem, 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 Powerful Bear Breathable System, the heat could quickly spread out, avoiding the embarrassment of sweat, also it's more comfortable for your back Rainproof surface, good for outdoor sports Description Product Description Features: Activity: Camping & Hiking Gender: All Occasion: Outdoor Material: Nylon Color: Blue,green,orange,red Function: Shock Resistance, Reflective Strip, Rain-Proof Dimension (cm): 40L:55cm(H)*31cm(L)*16cm(W) 50L:60cm(H)*32cm(L)*17cm(W) 60L:65cm(H)*33cm(L)*18cm(W) Type: Backpacking Packs Capacity: (L) 40L-60L