Survival... when you use your black permanent marker to date your cans... (which I'm sure every good prepper does)... you could write the expiry date on the can instead of purchase date. Then... a quick glance at the other cans of chili tells you where to add it into the line. 
[Yeah right! Label my cans he says. Humph!]
[Yeah right! Label my cans he says. Humph!]
