When your comforter isn’t on your bed, you’ll want to fold it away somewhere where it stays clean and dry. A closet shelf is a perfect place to store a comforter for many. If that’s not an option for you, try a storage bag that you can stow under your bed. We strongly recommend against placing a comforter in a plastic bag for long-term storage. The bags can trap water and moisture inside, giving mold and mildew the conditions they need to thrive. You’ll want to avoid keeping an unused comforter in attics, sheds, and garages. All too often, these places expose your comforter to pests and moisture.