Note: There is no mobile power comes with the backpack inside!!!
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
3.Connect your phone with the USB interface outside the backpack
4.Charging begins.
Size 1: Crossbody Bags
Gender: For Men
Pattern Type: Patchwork
Handbag Size: Medium(30-50cm)
Closure Type: Zipper & Hasp
Interior: Cell Phone Pocket,Interior Compartment,Interior Slot Pocket
Occasion: Versatile
Main Material: Canvas
Strap Length: 38cm
Product size (L x W x H): 17.00 x 7.00 x 35.00 cm / 6.69 x 2.76 x 13.78 inches
Size 2: Backpack Bags
Feature: Stocked
Pattern: Solid
Form: Separate
Materials: Canvas,Polyester
Package weight: 0.744 kg
Product size (L x W x H): 28.00 x 12.00 x 49.00 cm / 11.02 x 4.72 x 19.29 inches
Package size (L x W x H): 20.00 x 13.00 x 30.00 cm / 7.87 x 5.12 x 11.81 inches
Package Content: 1 x Backpack, 1 x USB Cable 
