I concur. I should mention that in my tiny wax roll, I do have a boot kit.
- patch kit
- boot kit
- crank bros tool (avec chain breaker)
- Lezyne pump (alloy road pump, quite nice and not bad at all to use)
- a $20 bill
Fits fine in any jersey (better so in ones that have a pump sleeve, aka Rapha) and no gauche "saddle nuts". That kit has fixed and saved 100 mile mountain road lost in the woods style excursions and other than clothing items, a minimal wallet, and my phone is all I carry (save drink and my garmin). It is not truly relevant, but I know and see plenty of professionals (I do ride in Boulder on occasion, after all) who have neither support vehicle nor saddle bag. Even if you've seen otherwise I don't know why professionals should dictate fashion, I mean we all remember Cipo's garish outfits in the late 90s. It's not as if the peloton always has taste...
And anyway, there's always Rule 29... and 30... and 31
Of course if you're on a mountain bike, the rules are different and the higher chance of "breaking something" necessitates a slightly fuller bit of kit, but that's not what we're talking about here.