HIM or IM race day supplies--bike specific?

I'm a big proponent of keeping it simple.

Here is my race day setup:

Sprint & Olympic - Torpedo or Torhans water bottle in the bars with a little bit of calories.  That's it.  I don't carry spares or anything else.  I have an "in it to win it" mentality for shorter races so I'm not going to take the time to fix a flat so I'll DNF if/when I ever get a flat.

IM & HIM - Torpedo or Torhans water bottle between the bars and another cage on the frame (that rarely gets used).  I just grab Perform or water as needed from the course.  I have a Trek Speed Concept with the draft box.  I put 1 spare tube, 2 tire levers and 2 CO2 cartridges in there.  I also tape another spare tube under my seat.  For an IM I will put another tube and CO2 in my bike special needs bag... just in case of emergency.

I have been lucky in that I only had one flat in a race and that was less than two miles from the bike finish so I didn't stop.

Tubulars make things a bit more difficult for obvious reasons.  I use clinchers so I can't give you any advice there.

I have both a Hed Jet Disc and a Zipp 900 Disc.  I don't need or use a crackpipe for either.  Paying attention to what bike pump, CO2 inflator  and tubes you use can make the crackpipe unnecessary.  That and some Dremel surgery on my Zipp 900.

How do you carry this on training rides? At some point you will be training with the same or similar set up as race day.

I just use the same small saddle bag with two tubes two cartridges, a Presta/schrader adapter and a small piece of rubber as a boot, whatever hydration system I chose for the distance and off I go. I currently have a profile aero-bottle and two cages for longer distances but I don't use those much, leave them empty but available if I want to stash a hand up there.

I ride on clinchers not tubulars so my setup is a little different but I always (train and race) with a small saddle bag that has 2 co2 cartidges, a spare tube, tire lever, and small inflator nozzle.  The nozzle is kind of shaped like a crackpipe so will work well with disc too.

If I'm doing an IM, I'll put a few extra cartridges and another spare tube in my special needs bag.

I've never had the misfortune to flat on race day but I'd just fold up and stuff the old inner tube back in saddle bag.  I could also stuff in a back pocket too.

It's pretty amazing what you can fit into a ziplock bag and then tape under your saddle to keep it out of the wind.

As far as tubulars...I carry a can of pit stop at the minimum.

I carry the same flat kit items racing as I do for training regardless of distance.  I've got a saddle bag with 2 tubes, 2 co2, tire levers, small multitool, small pocket knife, zip ties, and 2 $1 bills to cover small holes in a tire.

I've debated getting the behind the rear bottle holders and stuffing everything in a bottle but I've seen too many bottles fly off the back during races. I can't tell if it causes any aerodynamic penalties but my saddle bag is no lower than a rear bottle holder would set.

I probably carry too much for a race but I'd rather have some extra tubes and such than to sit around waiting for a sag wagon to eventually show up.  BTW, the dollar bills are magic if you get a slit in a tire just big enough for the tube to get pinched in it.