With a few simple steps, however, you can get away with using a 70/30 Butane/Propane mix pretty much year round in the UK - or extend a Butane canister's range by a few degrees. If you think of the gas canister as being as susceptible to cold as your camera batteries the idea of keeping it under wraps as much as possible soon becomes second nature. It doesn't need to be obsessive, just simple steps like packing it in the middle of your pack rather near the outside or wrapping it in an insulating sleeve. We use an old Jetboil sleeve, which is the ideal diameter and can be doubled over on smaller canisters, but we've seen an old wetsuit sleeve and even a merino sock used. As long as the sleeve can trap a layer of air between it and the canister it should do the job, and when the temperature really drops and you have to resort to keeping your gas in your sleeping bag overnight it's a lot more foot friendly wrapped in a sleeve than cold, bare, metal.

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