I second the cooler idea. Mine holds exactly 50 4x5 holders and lives in the car on long trips. Each holder is in its own quart-size ziploc bag, which keeps darkslides in place and dust out. I carry six or seven with me on day hikes. I rotate through the holders in number order and reload when I get to 100. For reloading, I usually find a hotel room with a windowless bathroom and spend an afternoon or evening unloading, cleaning and reloading. I carry empty film boxes marked N-1, N, and N+1; N-more and N+more holders don't get unloaded, even if the "offending" exposure is only on one side. The number of these is always small, so I can still load 80+ new sheets. It rare for me to shoot more than 150 sheets or so even on a three-month photo safari (guess I'm picky...)
Hope this helps,
Doremus Scudder
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