What you are looking at here is an imitation of the food packs in a R.A.F. survival pack. It's not actually a bad compromise for someone who needs something that's storable and either doesn't have our level of experience or does not want to be bothered. The calorific value of the mintcake - which was developed for high altitude climbing/artic exploration - is very high. It will certainly do for the 1st 24hrs or so and believe me living on mintcake & oxo cubes will motivate anyone to get their ass rescued!