Large capacity waterproof backpackBag size: medium Capacity: 36 55L Internal structure of the bag: computer pocket Opening method: zipper Applicable gender: Neutral men and women Material: Nylon Whether with a lock: No With or without rain cover: None Function: waterproof, breathable, anti theft, wear resistant, lighten, shock proof Processing methods: soft surface Hardness: medium to soft pattern: plain Lining texture: polyester Types of accessories; backpack shoulder pads Strap root