Bopai 751-006641 Large Capacity Business Fashion Breathable Laptop Backpack with External USB Interface, Size: 30 x 15 x 44cm(Black) 1. Anti-theft zip pocket on the back for secure wallet storage. 2. USB external interface design, plug and play. 3. Waterproof fabric is used, which is impervious to water. 4. Large area ventilation and heat dissipation, hollow grooves enhance air convection, and effectively cool down in summer. 5. With a card holder, easy to travel. 6. Concealed water cup position, rubber band fixed water cup, no shaking, reducing the chance of wet pack. 7. The internal structure is clearly defined and the space is allocated reasonably. 8. The detachable shoulder strap can be stored in the back pocket after being disassembled and converted into a business cross-lift mode. 9. Material: Microfiber synthetic leather + fabric. 10. Product size: 30 x 15 x 44cm.