While some of my lenses are weather sealed, most are not, and I began to fear for the worst: Lens mold. None are moldy or otherwise show any defect, but I don't want any future problems, especially if I end up swapping or selling a few of my lenses. Instead of relying on these gel packs, which are hard to recharge in the microwave due to being sealed in plastic baggies,  decided to buy a sealed case from the only manufacturer of them that I fully trust: Pelican.