Souvenir/Extra Bag. One bag for so many situations. Two large expanding sections allow you to adjust size for what you need it for: Beach tote, laundry bag, shopping bag. It starts at 15 inches and expands up to the max 21" carry on size. Perfect for hauling home your treasures. Has strap to slide over your suitcase handle. Super strong material but lightweight. Wouldn't go on a big trip without it!