If you plan on staying in one place, if at all possible, canned goods are a very long life solution---like much processed food, they will be high in salt and probably fat, but this might be a good thing in a survival event situation. I mark my cans with the year I bought them and try to rotate them thru, but sometimes, a can will be missed and you'll find a very old can, like say, a can of soup or refried beans from 10 or more years ago (!). My experience has been, if stored properly, the contents will still be quite eatable---if it looks good and smells good, it's probably OK---pressurized cans are definitely a NO GO! Of course, besides cans, dried stuff like rice, beans, pasta, etc should be part of your program---again, properly stored...