My 7 day pack (always in my SUV) contains 1 2400 cal mainstay per day and two of these, per day.
http://www.spam.com/products/classicsingles.aspx

I'm trying to survive and endure...not concerned about enjoying my meals. I carry no "comfort foods": instead I use that space/weight for extra water.

Now my 30 day larder is a bit more concerned with variety and balanced nutrition. Not my 7 day pack.