Anybody know if a gaz lantern bivouc 270 will fit any other fuel cannister such as MSR?
Nope ...it won't. GAZ uses that "twist latch" compression attaching system and all other iso-butane canisters have threaded tops. I started out using GAZ stoves/canisters years ago and that was the main reason I switched to the "other" type. Of course now I use an alcohol stove most the of time.