The bigger one is my daily, the smaller one I take with me hidden, to places where it would be ridiculous to have the other strapped on me. I generally carry them for absolute worst case scenarios, but I generally also like to be prepared for anything. The bigger one functions as a bottle opener and a flathead screwdriver too so it's definitely come in handy. Thankfully, I've only ever used the knife for opening things so far, but it's still a nice peace of mind for someone who enjoys 3AM walks alone in SF.