1. Fabric: canvas 2. Lining: polyester cotton 3. Internal structure: tablet pocket, concealed compartment pocket, mobile phone pocket, ID pocket, etc. 4. Hidden double shoulder straps can be stored in the zip pocket when not in use 5. The length of the shoulder strap is adjustable, suitable for different groups of people 6. Fine sewing, strong and durable 7. Metal shoulder strap with buckle design, not easy to wear 8. With expansion adjustment function, the thickness of the bag can be adjusted, which is convenient and practical 9. Weight: small size 1.25 kg; large size 1.45 kg 10. Size: small size 38.5x28.5x13 cm, large size 44x32x13 cm
