Note: There is no mobile powercomes with the backpack inside.

If you want touseExternal 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

3.Connect your phone with the USB interface outside the backpack

4.Charging begins.

There are 2 kinds of mobile power in the market.

2017 Casual Nylon Solar Powered Backpack for Men 25L Fashion Cell Phone Charger Knapsack Anti-theft Multifunction Rucksack Women