1. This backpack is comfortable and soft,the padded back design with thick but soft multi-panel ventilated padding, gives you maximum back support. Breathable and adjustable shoulder straps relieve the stress of shoulder. Foam padded top handle for a long time carry on.2. With built in USB charger outside and built in charging cable inside,this usb backpack offers you a more convenient way to charge your phone while walking. Please noted that this backpack doesn't power itself, usb charging port only offers an easy access to charge3. Made of Water Resistant and Durable Polyester Fabric with metal zippers. Ensure a secure long-lasting usage everyday.Serve you well as professional office work bag,slim USB charging bagpack, back to college backpacks.