I agree totally with Lorchen! The quilts need to be able to breath, but I would even add to the outside of my roll, some batting that I might have on hand. More breathing room. Ideally, you would not want it in a plastic bag, but since "life happens" it would be advisable to have the final bag be a strong, air tight bag. And, of course something to capture the moister, like the silica gel. Just buy a big bag/box of it at your local craft store, and make your own little sachets. I would not put them right next to the quilt, but probaby between the batting and the plastic.
Dawn
In beautiful Northwest Montana