A friend of mine in the Canadian Forces gave me a couple to try out. They were pretty good for packaged food.No self heaters though,just sit the foil bag in boiling water for a couple mintues and.. voila..one hot Meal Ready to Eat..!

Most of the time though you can do pretty well with regular super-market stuff.Canned stew,beans, dry noodles and all sorts of pre-packaged foods work well and are easy to heat up.