So, I ordered 2 of the 2400 Mainstay food rations to throw in there. My question is, would the Mainstay rations fit the bill? With 1 of the 3600 and 2 of the 2400 bars in there, plus the granola bars, would the MRE entrees even be necessary?
If you've got the room to spare, I would definitely keep the MRE entrees (and anything else) to help you cope with those Mainstay rations.
I would certainly eat the Mainstay "bricks" if there was no other option; but, (in my opinion) those Mainstay rations are a bit tough to consume, because of their bland taste and chalky texture.
So, being able to vary your meals with some items that are more "normal" could be a big asset.