My stash is in clear totes. I get into them enough they do get air. Opened one of the totes the other day and there was a bit of a slight odor. Found a remnant with a wrap around tag, I had overlooked. Looked through the tote again and found another also. took them both out and washed in hot water then threw into a hot dryer. No more odor. Had a couple packets of silica gel and tossed them in to help absorb any odor or moisture. Does make a difference in prewashing. Just had a bit of a sour off odor.