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. | Structure: main duffel bag 3 storage bags，laptop special bag front small bag water bottle / umbrella bag mouth hidden shoulder strap design front panel night travel reflective safety strip.（NOTE: There is a zipper on the shoulder strap, which can be used to put away or take out the shoulder strap by opening the zipper.） | Upgrade and Reinforcement: This model has been upgraded many times. We have used multiple materials for multiple tests to ensure that the quality is strong. We have strengthened the parts that are easy to crack and adjusted the center of gravity in size.Make it more portable for a long time, and refer to the actual experience in the design of details to optimize, reliable and ensure long-term use.