Three-dimensional design. Feel secure for your belongings in overcrowded places as these bags are Anti-theft, cut resistant, burden-reducing. Hidden back zip-pocket for your documents or phone. Anti-theft zip technology. This backpack will be great for travel, business, and leisure. Enhanced with a USB charging port, for convenient and always accessible phone charging on the go. 180 open and close design is very convenient for packing. Very high capacity. Only this model features a cell phone sucker system on shoulder strap - keep your phone just one move away!