I've bought more than a few of the space bags. When they work (hold the seal), they are great. Again, when they work, they've held for months. When they don't, you can hear the air come in. Can't figure out why one works and another doesn't. Can't find or see a hole. It is frustrating as they are not cheap. But I can store so much by using them.
By the way, have a sleep comfort bed for I think 8-10 years. Love it and have had no problems.