I have been carrying a tire repair kit with compressed air cylinders for more than 11 years. Fortunately never had to use it...tubeless tires seem to be built better than older tube styles.
Two questions regarding the little cylinders
1. Do these things have a shelf life?
2. How many are needed to pump up a plugged flat?
Always carried a spare tube with my airheads...had more than 6 flats over the years on those bikes.