AIRLINE APPROVED: Travel backpack size: 18.5*12.2*10.23 inches. Maximum capacity: 40L, carry-on backpack meets the size required by almost all major airlines and fits in the overhead compartment and under the seat. Of course the lie-flat opening design helps you get through security quickly. This travel backpack is perfect for weekend trips, business trips, hiking, camping, etc. | WHAT IS IMPORTANT : The most important thing about traveling is having fun, not being tied up in chores. The laptop backpack comes with 2pcs clothes storage bags and 1 shoe bag, different sizes can be used for different packing purposes, allowing you to store your clothes more conveniently and in an organized manner, Dedicated shoe bag fit 1-2 Pair of shoes or it can be a laundry bag for separating your dirty clothes. Make your luggage clean and tidy. | UPGRADE ITERATION： Expandable design added for the first time, with 25L-40L of travel backpack storage space to change as you wish, the maximum capacity can store 3-5 days of clothes. Of course, it does not stop there, the backpack also has a built-in elastic band, which can be compressed clothing, prevent clothes from falling, maximize the use of the backpack storage space, saving an additional 10% of capacity. | CREATED FOR TRAVEL: Comfortable airflow back design with thick and soft padding, effective back pressure relief, while equipped with adjustable chest buckle, so you hiking more easily. The computer backpack is made of water-resistant polyester, to provide safer protection for your belongings in unexpected weather. | WHAT WE CARE: BAGSMART hopes to sell not just a commodity, but also a love. Love to travel, love the outdoors, love the journey of you. If there are any quality problems, please do not have any hesitation. Contact us for a timely and satisfactory answer!