It came with the Toaks pot. Saw an ultralight fanatic on YouTube ditch the bag in favour of a rubber band, it saved something like a whole 10g!
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Ran a similar system but I found too inefficient in wind as most of my trips are high in the open ground. On multi day trips you would have to carry 2 canisters.
I have gone to the micro mo jetboil which is quite an efficient wee system in wind.