This large-capacity backpack with USB charger is made of high-elastic polyester Oxford fabric, water-repellent design, and internal multi-layer loading design, which can accommodate daily items such as 17in computers, SLR cameras, tablets, etc.Features:External USB interface: convenient to charge at any time to meet travel needs.Water-repellent fabric: high-elastic polyester Oxford fabric, water-repellent design, to protect the safety of internal items.Large-capacity multi-layer loading design: it can accommodate 15.6-inch computers, SLR cameras, tablet computers and other daily necessities.Ergonomic carrying system: reduce the pressure on the back and provide a comfortable carrying experience.Detailed design: triangular dates, top handle, reflective strips, adjustment buckles, USB sockets, side pockets, two-way sliders, trolley case fixing straps and other detailed designs reflect the product's thoughtfulness.Specifications:Color: black, blue, gray, redMaterial: Polyester high elastic Oxford fabric foam Lining: PolyesterSize: 46*32*16 cmWeight: 650gPackage list:1 x Large capacity backpack with USB charger