Our ZipSak 4-Wheeled Folding Duffel is a new wrinkle in luggage. Its patent-pending technology allows you to fold it into a 5" deep built-in pouch when empty for easy storage. It has an incredible packing capacity and smoothly spinning wheels for easy maneuvering. It's very convenient to pack and it's versatile: the wrap-around zipper and interior compression straps let you pack it like a traditional suitcase while the zipper at the top lets you pack it like a tote. It's great for small spaces, packing it inside your luggage so you can bring great finds from your trip home, and for taking to camp.