This is related but not a heat tab so to speak. I learned this about 40 years ago, and don't remember where. Roll a news paper as tight as you can to where the diameter is about 2". Take a spool of thread and take several wraps around the paper roll and then roll the thread with your hand so it will not unwind itself. Do this several time spacing the thread wraps about an inch apart. When you have all the thread wraps the paper will hold given the spacing, cut the roll into pieces about 1 1/2" long with a hand saw. Next drop these rolls into a pan of VERY hot parrafin. Do this outside or in your shop as you want the rolls to fry like food in hot grease. This will completely saturate the rolls of paper. When they stop frying take them out and let them cool on something. When cooled off, they will be hard as a rock, not messy as the wax was so hot there is no buildup or excess. Throw a couple in you daypack, camper, whatever. When needed, just pull an edge of the paper up and light it. They will burn for a long time, no smoke, and impervious to wet weather. You can heat cup, even small pans of water, coffee, and even cook small meals with them. They will many times start fires with really wet wood, due to their longivity in burning.