Casual Canvas Three-Purpose Business Briefcase Computer Bag, Color: Black Large1. Fabric: canvas2. Lining: polyester cotton3. 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 use5. The length of the shoulder strap is adjustable, suitable for different groups of people6. Fine sewing, strong and durable7. Metal shoulder strap with buckle design, not easy to wear8. With expansion adjustment function, the thickness of the bag can be adjusted, which is convenient and practical9. Weight: small size 1.25 kg; large size 1.45 kg10. Size: small size 38.5x28.5x13 cm, large size 44x32x13 cm