To keep me full I go with those high protein/high carb candy bars. There like $3 a piece but with 40 gr of protein and 40 gr of carbs they fill up the stomach decent. They are not always the best tastin and very hard to chew up when their frozen but they do the trick on a all dayer hunt. If I dont take that I go with crackers and jerky. Always in a ziploc bag.