Duchamp London expandable travel backpack suitcase featuring expandable side zippers, each expandable to 4”, tech friendly pockets, a USB port with cable ( no battery), interior mesh pockets, zippered side pocket containing a mesh water bottle holder, and a sleeve on the back that slides easily onto the extended hanfle of rolling luggage. See pictures for more descriptions of the many features of this bag. I have used mine with only one compartment expanded under the seat for air travel but functions perfectly as a carry on. Great travel bag for air travel or just weekenders.