Any Kashi granola bar there is. Sorry to promote a company but these are the best I've found with the addition of the Caribou Coffee Company's Mocha Java granola bar. That one has a shot of espresso in it, a great addition to the early morning hunt when you only have time for one cup of coffee.I usually have 4 of the granola bars of different kinds, an Empire apple or two, half a gallon of water in a canteen or now a hydration bladder, and half a gallon of iced tea in my huge camo mug that has a closable drink vent that I can hang from a bow hanging hook on a tree nearby.
I sometimes take a sandwich or two of simple, easy to eat types.On cold days I take a two thermoses one with coffee one with soup. After five hours on the stand in zero temps a cup of hot soup just revives you like nothing else.