This will keep you going. You may mess your pants, but you will not be hungry. I used to eat this stuff when cross country skiing and winter camping. This amount of butter only makes sense if you are sleeping in something you made out of snow, or, erh, if you only have 1 jersey pocket to load food into.
Also, sometimes my wife and I make about a dozen burritos on Sunday and wrap them in foil. They make a great lunch for the week. I also keep nuts in my office.