Are you kidding? I thought we all EDC so many knives that we can just keep using a fresh one. Who has room for a sharpener?
When a buddy of mine got married, I gave him one of those "chef's choice" kitchen knife sharpeners. He said he didn't need it, because their relatives gave them about 5 knife sets. "Honey, this knife is dull." "Ok, get another out of the closet."