Spam has more calories and lasts just as long. If you want carbs as well, add canned fruits and vegetables.
Any kind of dry bulk food will also work as long as you take proper measures to keep mold and insects out. Bonus points if you can also keep oxygen out. (Grains often contain a surprisingly large amount of lipids that can go rancid.) In the kind of emergency where you'd be seriously worried about the "other end", you could very well exchange a bag of rice or sugar for a handgun or a bottle of motor oil.
Any kind of dry bulk food will also work as long as you take proper measures to keep mold and insects out. Bonus points if you can also keep oxygen out. (Grains often contain a surprisingly large amount of lipids that can go rancid.) In the kind of emergency where you'd be seriously worried about the "other end", you could very well exchange a bag of rice or sugar for a handgun or a bottle of motor oil.