OUMANTU 8191 Large Capacity Multifunctional Waterproof Travel Backpack with USB Port Features: 1. Water-repellent fabric, safe and secure 2. Large capacity and multi-compartment design to meet daily outing needs 3. USB port design on the side of the backpack, charging is more convenient 4. Expandable design, 24L-30L two capacity modes can be switched freely 5. Wear-resistant material, puncture-proof, not easy to damage 6. Load-reducing shoulder strap design, fits the shoulder, cushions and reduces the load Product parameters: 1. Material: nylon 2. Lining: polyester 3. Capacity: 24L-30L 4. Computer size: 16 inches 5. Product size: about 45 x 17 x 31cm 6. Weight: about 1100g 7. This product is manually measured, and there may be errors of 0.1-0.2 mm and 0.1-0.2 grams in length and weight; there may be a slight color difference due to display and light problems. Please refer to the actual product! 8. Note: The shipment only includes the backpack, not the other items in the picture!