Good GRIEF!!! Thanks for reminding me, I have a spa right outside my bedroom on the patio that hasn't been used for....well, 12 or 13 years or so, sometime in the late 90s. I just went out and lifted the lids, totally dry and no mold. That will be a marvelous place to store patio furniture during the long and rainy winter. I had never thought of it, even though I walked by it for years. It's partly sunk into the ground, top about waist high with 2 lids that match very well. I do have stuff on top of it...now I'm going to put stuff IN it.