I buy by the bolt/roll too and my sewing room is in the basement. Kept my extra one in my bathroom down here too. Now I have it hanging on a pole between the rafters over my cutting table. I've had batting for years in some of my drawers too and nothing seems to go bad for me. Some came while I still lived in Florida which is very humid year around. Now I live in Iowa and right now my basement is claiming 10% humidity. Might have to invest in a humidifier yet.