In one of the classes, we used one of the can openers that cut around the can and leaves the lid real intact to open shallow cans, like tuna. We'd eat the contents and clean the can. Then we'd use corrugated cardboard and mark it so that it was just about a 1/4" shorter than the lid height so that the hollow parts were vertical to the can. Then we'd tear the cardboard along that line so there was a ragged edge left. Roll that cardboard as tight as you can get it inside that can. Get everything real nice and warm and pour in melted paraffin to the torn edge. As the cardboard soaks up some, refill it. You can replace the lid and even seal it in place if you want. Now...once it's all cooled off, if you remove the lid and light that cardboard (waterproof, no greasy mess) it will really get to a flame the diameter of the can and it can get to be about 2' tall. Quite the flame. You can tone it down by just poking a hole in the lid. We would poke a hole using a screw driver or a punch, awl, what have you and make sure it's off center. The flame will be similar to a candle. Just use a pliers or a wire to move the hole to a different spot once in a while. Pretty much every snowmachine in town had at least one stuffed in the storage area. Super cheap so you don't care if you lose it or it gets beat up. Waterproof. No mess. Durable. EDIT TO SAY THAT YOU CAN USE THE LID TO EXTINGUISH A FULL ON FLAME OR JUST ROTATE THE HOLE REAL FAST AND YOU CAN PUT OUT THE CANDLE FLAME. FOR REUSE OR WHATEVER.
One of those in one of
THESE and you could stay warm with a Walmart sleeping bag in -40F weather. I'd build a series of those as shelter where I went out fucking around so that one was never very far away. Line the floor with a caribou hide and throw a tarp on top to that. I'd light off my MSR stove for a little while to get the heat up enough to start melting the walls and then one of those candles would maintain the temperature at about 25-30 degrees. Which is quite warm. Warm enough that a cheap sleeping bag will keep you nice and toasty.