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I take a Primus EtaExpress stove with me when camping, and am slowing accumulating a collection of canisters with only around ~20% gas in them.

With this little gas, they don't have enough pressure to be useful in anything except ideal conditions (hot, windless, and you have all the time in the world) but I'm reluctant to dispose of them.

Is there a good way of constructively using up the remaining gas - and what's the right way to recycle the canisters when they are properly empty?

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up vote 6 down vote accepted

To Dispose:
Vent all the fuel, then puncture the sidewall. Once you have done this, it can be dumped in the appropriate recycling bin. Jetboil makes a tool to help with this, for which they've made a nice instructional video.

To Use:
An option to wasting that last 20% is to have an inverted canister setup. Since this relies on gravity instead of boiling via depressurization then you will use more of the fuel, but is going to be heavier to carry.

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