I'd pass on the mothballs. I'd be afraid my food would all come out tasting of mothball. Most plastic bags are permeable, including all regular consumer bags, and I don't believe any potential deterrent benefit is worth the risk of ruined grub.

Metal cans or plastic? If you can still find metal, I don't think any critters will have a chance of getting in.

Fun mental exercise! I kinda like the pipe section idea, although I'd go with 6 or 8-inch.

p.s. What's the BMT?

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I hear ya on the moth balls - that I am still considering - for more than one reason. But I figured if they were such a strong canine deterent that they would work on bears as well. I have heard that diesel fuel is used in the Artic to deter Polar Bears and from what I read it really works. That is the line of thinking I was aiming for. I guess I should relax and do my best - take it as it comes. If the stuff is gone when I get there I can figure something out.

It aint no mountain for a mountain man.
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--Rick