scafool, IMHO, the packability is second to efficiency. If you can run to the woods with your BOB in case of a major disaster, you will be able to find plenty of wood for cooking in a simple tin can over the open fire. Forget all these high-tech stoves, concentrate on the primitive skills, and pack more usefull things in your BOB. But if you have to stay home, in a city, all the nearby sources of fuel (propane, gas, wood) will became scarce very soon - too many people around.