I guess I must be fearless.

Spare tube two tire levers.
Pump
Presta valve adapter

Or

Spare tubular tire
Pump
Presta valve adapter

Every once in a while a 5 and 6 mm allen key for when I think I might wish to adjust a seat or stem/bar.

I have had few failures while out.
Over the past four decades, I have broken a brake cable twice both times at the "lead" end.

I take a bit more on a mtb. but not that much more.