Men's casual business backpack, large capacity computer bag, waterproof fabric, suitable for daily commuting, school, travel

Specification: Product Name：Casual Business Backpack Material: Polyester Color: Black/Blue/Grey Size: 45 * 30 * 12.5 cm Weight: 0.58 kg Note: 1.Please be reminded that due lighting effects, monitor's brightness/contrast settings etc, there could be some slight differences in the color tone of the website's photo and the actual item. 2. Item Measure by hand, it could be 1-3 cm different,your kind understanding will be much appreciated.