I've got a little white box duo alcohol stove that I use with a set of snow peak trek combo pots. I heard a while ago about a really simple idea.
Do you know the silver ducting that is sometimes used in industrial ac units, bit like tumble dryer tubing but foil instead of plastic. Just type in aluminium ducting into google and you'll see what I mean Well I got a load out of a skip, few meters, cut a section off and use that. Because its got springy metal in it you can stretch in out and it will stay up.it comes in loads of different diameters( mines 9" I think), It squashes down pretty thin, and if it gets wrecked or deformed to much, I just bin it, and cut a new piece! Simples!