I have been there! I have used space bags for a while. When I buy a project's worth of fabric, but I'm not ready to work on it and I want to stash it away I use the smaller bags. If I get tired of a project and I want it out of the way until I can get up the patience for it - I put it and it's accompanying not cut fabric etc all in a space bag and store it away - flat, small and contained.
I highly recommend this method!!!