Okay, another question. I was looking at canisters in the local Mountain Equipment Co-op, and it looked to me like the MSR isobutane/propane canisters had the identical connector to the Primus butane/propane canisters.

Assuming this is correct, is it safe to use the MSR canisters with the Primus stove? Both Primus and MSR state that you should ONLY use their canisters on their stoves.

I can think of several situations where this information might prove valuable. For one, suppose I bought a MSR stove as a lightweight backup - it would be nice not to have to buy two sets of canisters. For another, what if one type is sold out but the other is available?

I'll stick with the Primus canisters for now - just curious to know if I COULD use a different brand in an emergency.