Kopack Deluxe Water Resistant Laptop Backpack Silver External usb port: Putting your power bank into backpack and connect with inner usb port. Easy to charge Smart phone without hassle to take out power bank Travel backpack with 2 Main pockets & 2 Inner pockets & 2 Front pockets & 2 Side pockets, provide a separated space for your laptop,phone,adapter cables,books,cloths,power bank,coins,bottles and more. Made from durable Eco-Friendly fabric with padded shoulder straps 2 Side pockets with adjustable elastic band, and they are flexible and durable for daily use backpack Backpack Size: (L*W*H)13518 inch, holds up to a 15.6 inch slim notebook laptop.