I bought the vacuum bags, interesting technology
But eventually they all leaked air and got fat again. I think some one here said to put duct tape over the port
I'm here to say though, when you take your quilts out to use, holy cow, gag me with a spoon. They smelled Terrible. I ran all of them in the dryer with freshener sheets 3 cycles.
One way you can save room is to quit buying backing fabrics and make double sided quilts...I've been doing that for many years and love displaying both sides. Even simple backs show the quilting to advantage, and complicated reverse sides are such a pleasure to turn over and use.