I find myself regularly camping where there is no burnable material and I've been wondering if there was a fuel of some sort that would burn for a while in a hobo stove for (friendly heat and light rather than cooking) that I could carry? Basically, is there a long burning but light substance that I could carry up that would give a good time to weight ratio? I'm not even thinking of something that roars with heat, more just a gentle warmth and light to huddle round but that isn't too hard to light or keep burning? The only thing I can really think of would be small lumps of turf.