The lid may feel like it shuts very tight, but a tight feeling closure doesn't mean an airtight seal.My coolerdour lid feels very tight, but if I put my mouth to the drain and blow or inhale there is very little resistance. Never had a problem with RH though. I would consider some kind of strip sealer tape if maintaining RH were a problem. Did you try coolerdour in the search feature? Theres plenty of info and suggestions in other threads.
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