Large capacity size: 11.75 inches*9.45 inches*20.08 inches (30cm*24cm*51cm) (length*width*height), about 40L Preferred Material: This backpack is made of high-density 900D waterproof oxford cloth, HD digital printing process, cool and novel pattern, waterproof, wear-resistant, SBS explosion-proof zipper, double thread sewing to prevent side pockets from bursting, reinforced shoulder top position sewing , to meet the large capacity and more load-bearing and durable, soft decompression and high elastic sponge shoulder strap, the load does not press the shoulder Versatile Design: Spacious when unfolded, versatile and practical compartments help you organize things easily, including 1 Front Pocket/1 Large Compartment Pocket/1 Left Pocket (Water Bottle or Umbrella)/1 Right Pocket (for store wet towels)/1 shoe pocket compartment, where large contains 1 mesh compartment pocket, 1 notebook shock-absorbing compartment, 2 zipper pockets and 2 for iPhone, iPad, stationery, wallet, clothes slot slot, power bank, etc. Comfortable and convenient: The shoulder strap adopts a hidden design, which can be hidden when it is crossed diagonally, and can be folded and crossed when carrying it, which can meet a variety of wearing styles. Complimentary crossbody strap Usage: Multifunctional backpack with adjustable long shoulder straps and hideable double shoulder straps, can be used as a backpack and messenger bag, suitable for gym bags, mountaineering bags, outdoor travel bags, business travel bags, etc. Gym backpack, waterproof 40 liters large capacity, suitable for gym, hiking camping and short trips