I wonder if you could rig up a spare battery like they do in camper vans, and use this to power heated motorcycle clothing ?
If camping at the same spot for a few days or more, enough green biomass will start to compost and keep you warm. ( six inches thick or more, you cant have too much) In Mons (Belgium) last year, I found a campsite that had put all their grass cuttings in a big heap. by placing my tent over it, the temperature inside teh tent was over 20C with frost outside. My tent is a cheap dome type that i can pick up and position by lifting it by the top.
Normally i sleep on a camp bed ( but then i try to avoid camping when it is cold). With soft warm compost under my tent, no need for the bed.
Re Butane not working in teh cold. I use a small stove that uses 270 or 470 cartridges. these are a 50/50 mix of butane and propane and will work fine down to -5c and less (I dont kno how much further as I dislike teh cold )
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