Backpack Usage: travel, hiking, school, Casual daypack, City backpack, laptop / iPad backpack etc.
It is a must-have gift for cosplayers
there will be have 1-3cm error due to the manual measurement.
(1 USB charging extension ) .
If you want to use External USB Charge Function, you have to do as follows: 1.Buy a mobile power 2.Connect your mobile power with the USB interface inside the backpack