Dimension: the backpack size is 40*31*14 cm/15.7*12.2*5.5 inches. Size for manual measurement, there is a 1-3 cm error is normal, the actual please refer to the received object shall prevail. MULTIPLE POCKETS: This backpack for traveling on airplane has 1*back anti-theft zipper pocket that can hold valuable items; 2*Side pockets for foldable umbrellas or water bottles; 1 *large pocket specifically designed for storing 15.6-inch laptops; 1*Front zipper pocket for storing small items; 1*Front pocket with unfolded structure, with two small compartments and a hidden zipper pocket inside; A special large capacity main pocket. EXCELLENT DESIGN: This carry on bags can combine two handles into one through buttons, improving the convenience of carrying; All zippers are made of alloy materials, with a delicate appearance and are not easily oxidized; The back of the backpack is designed with a fixing strap, which can fix the backpack on the lever of the luggage suitcase; The two