Apologizies in advance for bringing up disc brakes but they do provide an advantage when riding out-of-true wheels. Just sayin...

I have one of those kevlar emergency spokes in my bag and, without wanting to attract negative energy, have not yet needed it. Having spare spokes is fine (and I do) but carrying the chain whip, cassette tool and wrench is a bit much. The emergency spoke should at least get you to a bike shop where they can install your real spoke.

Also, when I recently replaced a spoke on my double-walled rim, I discovered that a slot screwdriver was necessary to get it started to the point the spoke wrench could take over. I hadn't thought of that.