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Just got an Esbit stove (repro) used by the Wehrmacht in WW2. Really lightweight and has nice solid fuel tablets if you can't find wood to burn. That is highlu unlikely where I am (northern Europe) but it's nice to have options
As for the obvious question: Making a full campfire is not always smart due to risk of lighting the entire forest on fire, with this handy little thing you can contain the fire more efficiently.