What are some good ways to waterproof a geocache / letterbox?
Has anyone got any good tips on how to (cheaply) waterproof a geocache or letterbox? Those pill pots used to work brilliantly - one inside the other - but now they seem to be rather hard to come by and while the typical sandwich bag inside a container seems fine for a while, after a few months things seem to start getting wet.
Are there any more sure fire ways of keeping the contents dry?
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The 'Lock & Lock' brand works well as the four-side locks ensures the seal is tight.
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I prefer the rubbermaid containers of various sizes that lock with tabs on all four sizes. You can get small ones right up to very large containers for any size of cache you need.
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A gallon size water jug like this works well, too, although I did have a bear tear apart one in a geocache because it apparently associated that kind of plastic with food.
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Use an ammunition box - commonly found at Army/Navy surplus stores or on eBay/Craiglist for ~$10 USD, depending on the caliber size of the box. .50 caliber boxes are larger than, say, 30 caliber.
Waterproof, cheap, and very durable.
Another option is to use Tupperware or something similar if a smaller size is desired. Buy higher-end containers that will be much more durable:
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