If you don't want to spend the money on a designer cooler like a Yeti, the very best coolers that can hold all your food and game (and then some) is a smaller, non-working chest freezer.
I found mine for under 50 bucks, it has 2 inches of rigid insulation, holds ice forever and with a hasp is about as secure as anything else. Having this allows me the luxury of not having to rush back away form the hunting if I down an animal, regardless of the temps.
I cut a plug out of 1-1/2 inch thick blue rigid insulation that lays on top of smaller volumes in the cooler when its hot to extend the ice.
Joshua