I used the space bags to store quilts and haven't had any problems. I just change them out with the seasons. I would NOT used the fabric softener sheet as it will stain. I don't use any kind of fabric softener when I wash my quilts because of allergies and I put them away clean and when the bags are opened, they still smell "clean"! I use All "Free and Clear" detergent because of my allergies. I may add baking soda or vinegar to the wash.