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Liquid fuel catalytic hand warmers

Recommendations for classic [liquid fuel hand warmers](https://en.wikipedia.org/wiki/Hand_warmer#Lighter_fuel). The ones that combust petroleum based fuel without a flame in a catalytic "burner".

Besides the normal considerations of build quality, usability etc, here a couple points specific to these types of hand warmers in particular:

- Ease of refilling (Hands freezing)
  - Flat base?
  - A funnel?
- Turning off (Many of these you're supposed to just run until fuel runs out)