The typical egg carton is just a little long for my refrigerator. It has to go in on a slope, which isn't always possible if other things are taking up room. So as I use up eggs, I cut down the carton, like this:
Then it fits easily, like this:
Sometimes I just start off cutting the carton in half as soon as I get it. I'm happiest, though, when the store has eggs in half dozens.