Having the option to use fuel lying about - downed wood, pinecones, leaves, grass, other debris etc. to boil water and cook seems quite useful. Useful both in extended exploring, as well as emergencies. Added advantages are no charring of the ground site as in campfires, not having to lug in/out fuel containers, usage economy, low-tech (read less likely to fail) etc.
Of course a trace from the burnt fuel is left behind, but seems a temporary disruption of the environment
There has been some previous discussion on Kelly Kettles, which work well. http://www.kellykettle.com/
You may want to look into the larger Thermette option too. They come in at least 2 sizes - .5 gallon and 2.5 gallon. The smaller is 3lbs. and 15" high. Comes with a cooking ring to set on top - allows placement of pots/other containers for cooking.
A little pricey perhaps.
Outsider
Of course a trace from the burnt fuel is left behind, but seems a temporary disruption of the environment

There has been some previous discussion on Kelly Kettles, which work well. http://www.kellykettle.com/
You may want to look into the larger Thermette option too. They come in at least 2 sizes - .5 gallon and 2.5 gallon. The smaller is 3lbs. and 15" high. Comes with a cooking ring to set on top - allows placement of pots/other containers for cooking.
A little pricey perhaps.
Outsider
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