BANGE BG-1909 Small Mens Outdoor Double-Shoulder Backpack Waterproof Traveling Computer Bag(Black)1. Material: leather abrasive 2. 180 degree closure, more convenient to access 3. Expanded body, reasonable layout, more organized storage 4. Wet and dry bag design, clean and hygienic 5. Cubic honeycomb back cushion promotes the free flow of air, keeps your back constantly dry and reduces the pressure on your back 6. Waterproof fabric, dry when water, waterproof and impermeable, not afraid of getting wet when traveling in rainy days 7. Smooth zipper