Here's another cheaper-than-dirt wood burning "stove" that weights less than any commercial model I've seen, and can compete with the top 10 on speed.

The wall-part is my pot stand/wind shield for my usual alcohol stove (made from an old can), and the bottom is a stainless steel lid from an old candy jar. Total weight, 40g. Total cost, 5 minutes of work.



-jh