This is a question that is best answered by your location and how humid your environment is. Out here in the dry western US air we can store our lenses in just about anything and they'll be fine. But for those living on the east coast, especially the south east where the humidity is over 90% most of the summer, you must be careful to avoid fungus growing inside your lenses. I've a friend who keeps his lenses stored with drieRite cartridges in a Pelican case. So far he's not developed any fungus.