actually too dry is also no good coz the lubricants can dry up quicker and the rubber parts will harden faster ;) i've been keeping mine at around 45%. i find that anything above 55% is conducive to fungus growth.
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A table spoon or two of silica gel, in an used medicine plastic, poke few holes, will do in a tag box. Too much will do damage, rubber parts melt or cake on camera and lens. Like mick say.