I always have put them directly in the tin and then sealed/closed the tin lid with a strip of duct tape. They seem to keep fairly well in the tin. Although they WOULDN'T be water protected in the tin as I have it setup, this may be a problem...
I don't know if this is the best way to do it, it's just the way I have done it. I once was like you...asking "what is the best way" and I just made something work that seemed to make sense.
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"By failing to prepare, you are preparing to fail." - Frankin