I just bought the collapsible Coleman camp oven that looks a lot like that for our wood stove or for outside use.
The Butterfly isn't collapsible, though. But you can pack a world of stuff in it when it's upside down, so no cubic footage is lost if that's a concern.
/johnny
One of the things about Butterfly is that they provide real equipment that is really used, day to day, by third world people. It's gotta work and be cheap.
/johnny