Been reading this thread and thinking a bit. I carry a 123 for backpack light camping, and a Coleman propane stove for car/heavy camping. Works for us.

But the simplicity of punching a few holes in the bottom of a coffee can as a field expedient wood stove seems to be a fine idea for a back-up to the first choice stoves. All I need to add to the kit is an old coffee can, which, with its plastic top, can be used as a storage container for other things, and a "church key" type can opener. This is a trivial amount of weight. Serves a useful purpose when not transformed into a wood stove, useful as a wood stove if needed, and cheaply replaced after use. I can't think of a good reason not to have this option available.

Am I missing something? So, maybe I'm asking why not carry an old coffee can and a can opener?