Hehe, or an old wooden curtain shutter.

I've got a 150 schneider that's pretty compact, and I'm thinking about looking for a tiny 90mm as well, then I'll have a very tiny & portable kit (the 12-shot film magazine isn't exactly tiny, but it fits in the recess at the back so it won't take much more room than the folded camera by itself). I envision throwing this sucker in the canoe or backpacking it places where I wouldn't really want to lug my whole 4x5 kit.