This simply won't do for the purists, but I use a DE any time I'm away from home.

Razor (You can store extra blades in the razor, just remember they are there!)
Can of soap
Brush.

No need for strop, and no worry about the blade somehow magically opening somehow and very little concern for moisture turning things "rustique"

I think the disposable Shavette route has merit as well. Dang it, I've been meaning to buy one of those for months now.