Modoker travel laptop backpack with usb charging port and reflect mark waterproof school bags for college student under 17 inches notebook, black, it is an upgraded version of the previous backpack. When walking in the city, have you ever think it’s troublesome to carry a heavy portable source? This product can solve your problem. You don’t have to worry about rainy days, because it has a waterproof rating of ip×4. By the way, reflective mark are designed to assure your security at night. External usb charging port – external usb port with built-in charging cable offers convenient charging of your electronic devices whether on a business or leisure trip. Multiple adjustable strap – there are many adjustable straps on the side, back and bottom of backpack, adjust whatever you want. It is convenient for mountain climbing. Specifications material: Royal oxford capacity: 30-40l dimensions: 21.3 x 12.6 x 6.3 inches weight: 2.2 lbs. compartment laptop compartment × 1 ( fits under 17 inches laptop ) spacious main pocket × 1 front pocket × 2 removable pocket × 1 side pocket × 2 pencil case × 2 purses pocket × 1.