20 inch Multifunctional Business Large Capacity Waterproof Double-Shoulder Backpack with USB Interface(Black)

1. External USB design, internal power supply and external mobile phone, free your hands.
2. High-density water-repellent fabric, coating process, waterproof, wear-resistant and comfortable to the touch.
3. Large storage capacity, can store items in categories.
4. The S-shaped design of the bag body is ergonomically distributed to reduce the pressure of carrying.
5. The handle is made of rubber, with reinforced metal lines inside, and it feels comfortable to hold.
6. Capacity: 18 inches/20 inches/22 inches optional