What I've done to waterproof my altoids tin has been to put a ranger band around it as a seal. It was a little tricky to get on, but now all I need to do is fold it down to open the tin, and fold it back up when it's closed again.

It looks great, holds it closed tightly, makes it waterproof, and can be useful in a pinch.

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When you step out that door in the morning you never really know what you're going to encounter.