I've used some boiler to trekking and mountain tours, the F1 Lite by Coleman but by works price / performance ratio ago certainly the best. The cooker can be folded up very small, but it is amazing what power lays on the day the little thing in boiling water. Especially when I'm traveling alone is the cooker top. I can tuck it along with a small gas cartridge in a Esbit Titanium pot. Perhaps the only drawback: The assembling is - you're a little practice has - somewhat fiddly, but otherwise a very good small but strong gas cooker.
