If you're not going too far, I think you're good with the Coleman/Igloo recommendations. The higher-end roto-molded coolers like Yeti, Brute/Bison, Pelican hold ice for MUCH longer but there are downsides (expensive, less capacity with similar dimensions because of the width of the cooler wall, and they are HEAVY). I second @krmitchell assessment, you can fit a whole deer (even a sizable buck) in a 65/70 cooler if you pack carefully. I've put a WT buck and doe (quartered) in a 100 qt Bison with plenty of ice for a long drive. But you need a friend to move that loaded thing around!