I carry 2 tubes, patch kit and 5 or more dollar bills to serve as temporary boots to get me home. Zephal HP or HPX pumps on all my bikes.
Whenever possible, I patch the tube at the time. That gives me a marker to where the issue is. I then find said issue and fix/remove it. (I carry a Leatherman that has a very square tipped pliers. Best tool I've ever used for removing tiny car thread wires and thorn tips.)