I don't do anything special to store it -- I just leave it in the shower area! But I am in California, and the first long-lived disposable I noticed was in Chile, so perhaps the climate helps. (That one, I think I had used, then gone home, then come back a year later to find it still on the wall of the shower enclosure, above the eye level of the people who would have cleaned the bathroom. I don't remember how long I had used it at first, but I got another 3 weeks out of it.)