The main body is made of canvas fabric (wear-resistant and durable, with a retro texture), and the lining is made of polyester fiber (smooth and wrinkle resistant, protecting items). It weighs only 1100g and is lightweight and burden free. The main warehouse has a large capacity and can hold laptops and books; External side/front pockets for easy access to mobile phones and keys, making daily small items extremely convenient. Classic drawstring+flip closure (flexible opening and closing), widened shoulder straps with brown edge reinforcement (comfortable to carry and not easy to break), suitable for daily commuting/school scenes..syi