I do a lot of underwater photography and videography. I will be unemployed very soon. I put a couple of these in the underwater box and even when I got in cold water they don't fog up! In my camera bag during winter snow photography, moving cold cameras back into a warm car can cause electronic problems. I always have 20+ of these on a child and the moisture evaporates very quickly. I use them and recommend! When the pack starts to wear out like it's no longer moving freely, it's time to replace! It should be the consistency of dry sugar, if it looks more like candy replace it ASAP :)
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