FWIW, I just returned from a trip with a 4x5 and all of three holders. I took two boxes-one for exposed film, and changed the holders in a dark bag, and a hurricane brush/blower to clean the holders with between loads. Not too bad a system. I've never tried grafmatics and don't know how to load/unload them in the dark but that would seem like a very viable alternative. Good Luck!