I’ve always had SOS food bars in my emergency supplies. They provide 2400 calories in a compact, relatively indestructible package with a shelf life of 5+ years. Here’s a brief review of this product. Each “brick” comes packaged in grease-proof, water/vapor-proof MIL-B-131 foil material. They measure about 4 ¼” x 3 ½” x 2”. However, the extra packaging “flanges” can sometimes take up more room. Within each package are six individually wrapped mini-bars. This makes it easier to spread the package over a day of meals or share/barter them with other people. Two of these mini-bars provides a serving of 409 calories w/ 8g of protein, 53g of carbohydrate, 19g of fat and 0.5mg of sodium. They are made of wheat flour, vegetable shortening, sugar, coconut, corn starch, corn syrup & vitamins – yum, yum. These are made to be “life raft” rations, so their low sodium content is not supposed to generate thirst. They also comply with Halal and Vegetarian requirements, if that’s important to you. Their low moisture content is supposed to resist freezing. No preparation is required to eat these. However, they can be mixed with liquids for drinking or mashed into a porridge The bars actually taste pretty good – sort of a shortbread consistency & taste with a little hint of coconut. When I first purchased these years ago, I thought that taste didn’t matter. After all, if you need to eat this food, things will probably be so bad that any food will taste good. However, I wouldn’t feel too bad living off of these for a few days. Each brick costs $3.65, but you can get better deals if you buy cases of 20 or more. They also sell a 3600 calorie brick (9 bars, $4.65), but I figure that 2400 calories is probably a normal daily diet for most people. I’ve always bought them from Emergency Preparedness Service in Seattle, but I imagine that you can find them elsewhere on the internet. So, if you are looking for a simple, durable food supply for your emergency kit or car, you might want to consider these.