Men’s Laptop Backpack With USB Charging Port Large Capacity Travel Backpack Teens College Student Schoolbag Daypack

Dear customer, the USB interface of this bag is just a transfer interface from the inside to the outside;
The backpack does not have a charging device (mobile power). There is a USB cable in the bag to connect the battery and the internal interface. The external mobile phone charging cable interface and the external interface are connected to form the principle of internal and external connection for charging.