]I think that fabric stored in a space bag would come out with lots of wrinkles.
Actually it doesn't come out wrinkled. When my sister passed I was sorting her things and needed a better way to store some of her things. I put pillows, blankets and afgans in the space bags and stored them. That was 3 years ago and they have held the suction. I sorted her fabric and put it in space bags untill I could get t he appartment cleaned out. The ones that I have opened, the fabric is just like it was when I put it in them. When you release the vacumn the air just poofes the stuff back up to normal. I only had one bag out of the whole kit I bought that didn't hold the seal. But , in my opinion, you need an undisturbed place to store the filled bags. They can be heavy filled. I decided that I would rather haave my fabric wrapped on the boards than in tubs or space bags. I have 8 bookcases filled with my fabric on the boards. Love that method of storing it. Of course I do still have some tubs. But at least I have a working selection of fabric to use off of. I go to the tubs when I need something different.