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Ebay. There are 2 types, Indicating and non indicating. The indicating stuff changes colour when saturated. Normally orange when dry, Green when saturated. You then dry it out in the oven on a very...

Peli case. It's the only option. And a big bag of indicating Silica gel.

Peli cases are watertight, and to a degree airtight. And the big bag of silica gel will keep the moisture out. They also...