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Which leads me to...

hand-warmers powered by Zippo lighter fuel...

I know that they used to sell these things years ago. You can still get them used off of eBay, but not brand-new any more. Why? Did some people burst into flames using those things? If they are safe, I was considering grabbing one or two.



The still make them. Cabela's sells them here

They work great. I use one duck hunting.

They are safe, but you obviously need some ventilation since it is "burning".