Multifunctional Waterproof Business Sports Laptop Backpack with USB Port Features: 1. Made of PVC encrypted polyester fabric, waterproof and wear-resistant 2. The trolley case fixing strap design on the back makes traveling more convenient 3. Back air circulation and diversion design, comfortable and breathable 4. Side USB interface design makes charging more convenient 5. Adjustable shoulder strap, easier to carry 6. Metal double zipper design, smooth and durable 7. Widened handle design, comfortable and not tight 8. Diamond facet structure design, three-dimensional and stylish 9. Reflective strip design, safe and secure Product parameters: 1. Material: Oxford cloth, polyester 2. Computer size: 15-inch model: 16 inches, 17-inch model: 17 inches 3. Function: breathable, anti-theft, burden reduction, large capacity 4. Product size: 15-inch model: 44 x 30 x 15 cm, 17-inch model: 47 x 32 x 15 cm 5. Weight: 15-inch model: 860 grams, 17-inch model: 900 grams 6. Note: Only backpacks will be shipped, nothing else!