Item: multifunction bag
Material: nylon 
Dimensions: 50 * 34 * 15 cm 19.6 * 13.3 * 5.9 inches for 17.3 inches laptop 
Color: black / gray 
Application: 1. everyday travel, business, school, outdoor 
2. for laptop, tablet, phone, pen and t Etc. 
The most interesting: 1. in business style 
2. Simple business design 
3. smooth zipper, easy to open 
4. Adjustable hard straps to reduce shoulder press 
attention: No mobile devices comes with a backpack inside. 
If you want to use an external USB charging function, you should do the following: 
1. Buy mobile devices 
2. Connect mobile devices with a USB interface inside the backpack 
3. Connect your phone with a USB interface outside the backpack
4. Charging starts