【Expandable Design Travel Bag】Before extended is 28L; after extended is 40L.You can expand the zipper and buckles according to your requirement.

【Carry on Backpack Flight Approved】The overall size meets the size standards of the aircraft, and the portable zipper opening facilitates you to quickly pass the airport security check.

【Anti-theft Multifunctional Backpack】There is a zipper pocket on the back of the bag, which can store valuables such as mobile phones and iPods, which are anti-theft and convenient.

【USB Charging Port】With built-in charging port enable to charge your phone anytime and anywhere.