Internal: aviation magnesium aluminum alloy; external: tough and environmentally friendly materialDimensions: height about 29.5CM, width about 24CM, thickness about 10CMUse: Shopping, leisure, school, etc.Simple exterior shape, large capacity, practical storage, no need to worry about capacityComfortable to carry: The bag is designed to be comfortable to carry, making it easier and less labor-intensive to use, and is strong and durable.Shoulder strap adjustment: You can freely adjust the length to your satisfaction according to your body posturePackaging list: 1*backpackNote:1. Please allow slight errors due to manual measurement. Please make sure you don't mind before bidding.2. Due to different monitors, colors may vary, please understand.Note:Hello, please pay attention to your shipping address when purchasing products. If your delivery information (e.g. name, street, house number, doorbell/box without name, etc.) is incorrect, the order will not be delivered correctly. )