A Crown or Speed with Grafmatics or a couple Graflex 23s is a good option, though a bit bulky. I actually preferred the Graflex 23 because roll film is easier to handle on the road. There also tends to be less dust on the negatives as well.

One thing about it, if you pack one of those around on vacation you will certainly know how to use it by the time you get back.

And whether you ever want to try it again!