Airline Approved: Size: 18.9 x 12.99 x 6.69 inches (L x W x H). This travel backpack meets the requirements of airlines, it can easily fit under the seat or in the overhead compartment, saving time for checked luggage, it is the best personal item for air travel. Anti-Theft Design: The backpack is made of polyester fabric, with 4 adjustable buckles on both sides to hold the shape of the backpack. The thickened sponge cushion design on the back and shoulder straps to absorb sweat-absorbing and comfortable. There is also a hidden zipper pocket on the back of the backpack, which can store important items such as mobile phones, passport wallets, and is convenient to prevent theft. Multi Compartment Design: This backpack has 3 main compartments, 1 shoe compartment and comes with a toiletry bag. Holds about 40L. The main compartment is fully open to hold your travel clothes. Front pocket is a dry and wet separation layer, which can help you sort and place sweaty clothes, wet towels, et