It's a great idea to have a spare RES for a different flavor. I was thinking about doing the same thing, but I had no idea how I would store it. Is there any chance that you guys could make a case for a spare RES? I was thinking something along the lines of a little cylindrical canister that has a pop-top cover....kinda like the plastic ones you use for rolls of film.
I had that very discussion with my partner at innovapor, Mark. We were thinking of a machined Delrin case, like you said essentially a old school 35mm film canister on steroids. We were arguing the benefits of a simply pop-top with a o-ring closure vs. a threaded lid, so that the case would be water/dust proof... thoughts?