Water Resistant Laptop Backpack

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 include the power bank itself, usb charging port only offers an easy access to charge,added and breathable mesh back panel of this computer rucksack design help for the air convection, ventilation and heat elimination. Comfortable wide breathable mesh shoulder straps with plentiful sponge pad help relieve the stress from your shoulder.More than 300pcs can customize colors.