My typical 3 day pack weighs about 35lbs even in the winter when we have field exercises. I usually don't have a big appetite in the field so I usually eat a few snacks during the day and a mountain house for supper. We are usually busy hiking 10-15 miles and doing first aid, navigation or some other training to be piled up eating for an hour. I usually have 4 mountain house meals, some beef jerky, some clif bars, some instant potato sides. I only carry 2-3 liters of water but I can filter as much as I want. I could carry 8L if needed. I have a MSR pocket rocket stove and a titainium cup to heat water for coffee, tea, or whatever.