What is the minimum I need to keep in my saddle bag?

[Starfish]

I've also used my chain breaker.
Have you thought about getting a Multi-tool, like a Topeak alien or Hexus? Granted, they usually don't work as well as the "full-sized" ones, but it would more compact and less stuff to forget

Thanks. I've got a small multi-tool that I carry, but have only had one lesson (a long time ago) with the chain tool...so I've got it, but don't feel confident about how I'd use it.