Port Designs San Francisco 15.6" BackpackThe Port Designs San Francisco Backpack is an elegant and connected urban backpack with plenty of features for modern city living. It has a built in USB port to charge your devices anywhere as you go, just plug your external power bank into the internal charging port and you'll be able to charge your devices from the exterior port. This bag contains padded compartments for your computer and tablet, as well as a large space to store all your