People who have bikes with S&S couplers, how do you carry the C spanner ?

People who have bikes with S&S couplers, how do you carry the C spanner ?

I imagine it'll be difficult to separate the coupling if you lose the C spanner.

I was wondering if there's a way to attach it to the bike frame so it is always available, because without it you're screwed lol.

Just wondering if there's some novel solution other than carrying it in handlebar bag or frame bag etc?