I live in Hawaii, in a humid climate -- years ago my bedsheets, stored away (after being fully dried) in the linen closet, would begin to get a musty smell -- even if they were put back on the guest beds and covered with the bed spread, the same would occur, making it necessary to either store dirty sheets until you needed them again (yuk!) or wash the sheets again when you needed them. Found the 2 1/2 Gal. ziplock bags worked fanastic for keeping the smell out, and laundry fresh. Use these for all my fabric storage -- after they have been washed and fully dried -- those in drawers, or bags or boxes. Never have a spell now....however, the books in the book cases have the same musty smell....so there's no winning on every front yet! PS: these are great for travel too -- all underwear in one, tops in another, etc....so when the PSA is checking them, they are only moving their hands (which have been in everyone else's stuff) along the outside of the bags.