About 13oz, maybe 1500 cal a day. Exertion level is relative in my opinion. Trail head to hunting area is 3-6 miles depending on where I end up. Elevation gain is 2000-2500ft. Once up terrain is rolling. I hunt with my camp and my gear is all light weight so there is no back and forth to a camp. I pitch where I happen to be. Some days I may not move at all. Water is much more of a concern to me. I will be taking 9-12 liters of water. I don't eat more than that, just not one that eats a lot. Most times I have to force myself to eat because I am just not hungry when hiking. Besides, its only 5 days.