The durable, weather resistant fabric protects items from all types of weather, while the molded polycarbonate back shell protects from the rough-and-tumble of air travel. The large internal mesh pocket separates clean from dirty items, and the external compression straps helps you adjust the bag's size according to how much you're packing. This carry on bag is built for all kinds of adventure, and uses sturdy materials to ensure the bag can be used time and time again.