1. Material: Oxford cloth + polyester 2. Capacity: can hold phone, shaver, glasses, umbrella, water cup, etc. 3. Size: standard: 18 x 10 x 35 cm, large: 20 x 12 x 38 cm 4. Opening method: zipper 5. Thick hooks: connected by hooks, easy to disassemble, can switch between left and right buckles 6. The internal structure of the bag: zipper pocket, mobile phone pocket, ID pocket, sandwich zipper pocket, camera pocket 7. Back zipper pocket: hidden back pocket, practical and convenient, with anti-theft function 8. Reflective design, warning at night is safer