Hmmm... Does anyone know how much the MRE's weigh? I'm looking at the Emergency Essentials catalog right now. They list MRE Main Dish entrees for $2.60 each. How much food is it? How much does it weigh? It looks just to be a foiled package that you heat up. That may get close to your goal if the food has enough energy.

But, I'm not military, so my experience with them is little to nothing.
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I always forget and make it more complicated than it needs to be...it's just walking.