Not sure how many people bother but I was looking for a way to save fuel and time this coming winter
Scrounged some cardboard boxes and a bit of fibreglass insulation/ and aluminium clad building board 25mm thick for the bottom
I wanted to be able to cook red beans without standing there stirring for 3 hours and to do so while I am out skiing. It got me to thinking that while big the efficiency makes them worthwhile and apart from pot cosies how many others use a hay box when out and about
Not counting the modern vacuum iterations but genuine home made heavily insulated slow cookers?
Mine has 50mm of fibreglass in the walls and 50mm of foam in the base and about 70mm combined it the top foam and polyester
If I boil the beans for 4 minutes on the propane they should still be warm and fully cooked when get back to camp at the end of the day and all I need to do then is bring up to serving temperature
I'll do the same for my breakfast porridge but in a small flask not the billy, that way I can eat it on the track after my stomach wakes up
On the same track I just added extra insulation to the base of the insulated soft bag I use to keep my hot water thermos's in