>>1191989For warmth id like to recommend pic related. They cost ~$20 for original at hobyking (you can get chinese ones for $5 but i have no idea about quality of those). The body is made of copper, the lid is metal and they run on lighter fluid or isopropyl alcohol (tested with 99% one, not sure about lower percentages). On half fill (~15ml) you will get about ten hours of warmth. There is no burning in traditional sense only catalytic reaction between platinum and alcohol that produces heat while the byproducts are water and carbon dioxide (not monoxide). The bag has a lanyard hole and velcro on the inside to keep the warmer from slipping out.
The original idea was to put it in my hammock underquilt as a heater, however it doesn't make any real difference so i put it around my neck and place it between my shoulder blades - the comfy levels are surreal. I've slept with it inside my sleeping bag multiple times now during winter camps, haven't set myself on fire yet. Also carried it in awkward positions in my pocket for weeks trying to make it fail - no go.
Somel tips:
Fill only before use, it vapors away pretty much in the same time regardless if its burning or not. Use small container (e.g small pills bottle) to carry the fuel.
If you need emplacement burners, etc this leaf is legit:
http://mparam.s3-website-us-east-1.amazonaws.com/ 