Material: PolyesterSize: 42 * 29 * 11.5cm 15.6 inchesProduct selling point: Waterproof fabric, scratch resistant and wear-resistant, sturdy and durable, breathable back cushion, lightweight backpack, multiple compartments, reasonable zoning, and numerous separated spaces. Side fast charging USB interface for fast chargingThe backpack comes with a built-in pull rod design, making it easier to reduce weight on both hands