The same FluxRing-equipped, jacketed cups with heat indicator and cargo pocket which come with the Jetboil Flash, Companion Cups expand the capacity of the Jetboil system without adding the weight of extra burners. If two of you are going out, you can take your Jetboil and a spare Companion Cup and, due to the phenomenal boil-time, the second cup will be ready hardly any time after the first. Share your lunch break without having to share your lunch!
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As an alternative, you may prefer.....