Anti-theft design. Main Zipper hidden. Main compartment zipper is been hidden inside of the bag, No one could see it and open it when you pack it. Also there are not any zippers outside the backpack. USB 2.0 Charging port design. Built-in USB cable. Use it to connect the power bank, then connect your phone with original USB cable to the USB port, you could charge your phone conveniently. Main compartment include laptop compartment, two tablet compartments, 4 pen slots, notebook pockets etc. CoolBell 15.6 inch anti-theft laptop backpack, A safe carry style for your city life. It is convenient and safe for your trip / work / weekend life. Bag dimensions:17.3 x 12.9 x 5.1 inches; Fits up to 15.6 inches laptop. Brand new brand SKU 100978842_NP-1021534023