The Powerbag Backpack is more than your average bag! The backpack is equipped with a battery system that can charge the average smartphone twice. Pretty convenient, huh? The external one-touch battery level indicator and power button make it easy to take advantage of the features. Even when your backpack is completely filled, the contoured straps and back panel will keep you comfortable. Includes Apple, Micro-USB and Mini-USB connectors and a USB port.