Could always just buy run-flat tires. They are more expensive and tend to have a harsher ride, but they eliminate the need to carry any tire-repair equipment with you, saving some weight. It also eliminates the need to deal with the messy fix-a-flat can.
If you go this route, if you don't already have a
tire pressure monitoring system in your car, you might want to install one, or else just be extremely diligent about checking tire pressure.