Carry and Travel: The large backpack carries 3 custom-made storage bags, which can improve your travel quality. The overall size meets the size standards of the aircraft, and the portable zipper opening facilitates you to quickly pass the airport security check.It has built-in elastic bands to keep your clothes from falling out. Size and Material: The travel backpack dimensions 18.5 * 12.5 * 9.5 inches and comes with a special pocket that can hold a 17inch laptop.The backpack can be fixed on the trunk pole and can also be carried by hand; it uses water-resistant high quality polyester Oxford cloth material and explosion-proof zipper. Application: travel, carry-on, weekend travel, Cross-border tourism, overnight, Move out of old house, suitcase, the shrink strap with it is convenient for you to compress without carrying luggage, into a smaller backpack.