we've started getting LMCs on a regular basis at my unit now which is good as we generally don't have regular meal hours and it's nice to be able to grab something quick that you don't have to cook
main entrees in the ones I've seen are Freeze dried cheese (not bad if you can get used to the squeeking when you chew it), Beef Jerky - dried out but pretty good, and pepperoni (my favorite but not everyones)
allong with the main entree you get 2 candy bars, a roll of candies, 2 pouches of juice cyrstals a la IMPS with included paper bags to drink them out of, a pouch of hot chocolate, and some fruit, either dried pinaple and pyappa, raisins or apple slices...
there can be a few other misc items in there... but it's fast to eat and can quickly refuel you for a few hours inbetween meals.