I just put a complete rain suit with knee high gators into a space bag and after the air was out it took up less than a 1/4 of the space it did when it was in its own plastic bag. This space bag is the one you just squeeze the air out of, me weighing in at 250 pounds just got most of it out by squeezing and then I sat on it in a chair, that was the finish touch . You don't need a vacuum to do the job. It came out nice and flat. Definitely the way to go if your packing for a good size jaunt around the country and want to reduce the volume of the clothes your taking....