Features:

Patented dual layers four teeth anti theft zipper, zipper macthed lock.
Separately laptop compartment desin,fit for 15.6inch laptop.
Free gift: A padlock-Protect your belongings with the easily accessible code lock while on the way.
Back hidden pocket, patent No.:ZL2014 30074080.6
The back pad is made of air permeable foam that feel soft on your back and weight balance.