I thought these would be a great idea as space is very limited around my house. I decided I needed to store a comforter that I do not use any more, so I purchased the large bags. After fighting with the bag for about 30 minutes to get the comforter in the bag and the bag sealed, I applied the vaccuum cleaner to suck the air out. It appeared to be going pretty good up to a certain point and then it suddenly wasn't getting any smaller... the seal had broken, so I had to start all over. After about an hour, I finally got it to work. Although, the package is not a pretty and flat as it appears in the advertisements, so it is a little more difficult to store than the ad would lead you to believe.