There is no mobile power comes with the backpack inside.
There are two models,With USB and Without USB.
Large size : 48cm*31cm*17cm,fit 15.6 inch laptop
Middle size : 43cm*26cm*12cm,fit 13 inch laptop
1 Inch = 2.54CM; 1 CM = 0.39 Inch.
Please allow 1-3cm (0.4~1.18″) differences due to manual measurement, thanks.
Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.
About External USB Charge Computer Backpacks:
If you want to use External USB Charge Function, you have to do as follows:
Q1:Is there mobile power inside the Buyer
A1:No have.You need buy a mobile power
Q2:How to use External USB Charge Function ?
A2:.Connect your mobile power with the USB interface inside the backpack,
Connect your phone with the USB interface outside the backpack,then charging begins
A3:How to choose mobile powerThere are 2 kinds of mobile power in the market.
1:Plug in your phone, you can start charging
2:Plug in your phone also need to press button of mobile power then start charging
To cope with this backpack, we suggest purchase of the first mobile power.