Keep em in the shade and they'll be ok for a few hours. I like to clean mine within a couple hrs of the kill if its warm out. Never had one spoil even when going 3 hrs on a very warm day when kept in the shade. Always best to clean them quickly, but I haven't seen one spoil in a few hours.
You could always carry a 70qt cooler with a few frozen 2 liter bottles. That will keep the whole bird plenty cool until you get home.
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