Interesting topic. I'm planning on taking6 large coolers on my DYI foray to CO this fall. Bone out the meat at kill site, package in multiple plastic bags, cool the meat in the multiple plastic bags in CO streams. Load the coolers with cooled meat and stop at the first store I come to for ice for the trip home.

Of course, all this is predicated on the assumption that as a first time elk hunter I'm exceedingly lucky and actually pot an elk.