Well, you open the can take out the wrapped hot dog bun, take out the packets or jelly and peanut butter and put the sandwich together. Ok so how is this a sandwich in a can. I could just do that at home in a plastic container for way less money.
But I agree that this is essentially an exercise in overpackaging. They already have MRE bread in vacuumed mylar packs. Tack on a couple of those PB & Jelly condiment tubes and you've got the same thing without paying for the gimmicky - and totally superflous - can.