I have been making homemade MREs before going on hikes or into the woods. I can put what I want into them, and pack as much or as little as I want. If you use the vacuum bags, etc. they can be completely water tight too.
Anyway, here is a youtube video that is kind of a tutorial. Remember, this is just a basic video, you can add or delete items as you want, and if you are like me, once the brain gets spinning, you will come up with all kinds of ideas on how to improve these. (I half cook pasta, the vacuum seal it and finish cooking it in the field and add some ragu..this is for camping, not just field hikes) but anywho, you get what I mean
http://www.youtube.com/watch?v=SzcLGzFxuTA&feature=related