for race day the mini carbon mighty - carbon, 59 grams, 7 bucks - it comes with a carry case but I just put it in a section of old innertube to stop rattling




flat kit :

Topeak ratchet, with inbus 3,4,5 en T25. 2 Tire levers and a supersonic innertube. Still have to buy a CO2 inflator instead of the pump.
In this picture it's a bit bulbous because of the tire lever and ratchet sitting on top of the tube. Nowadays those sit on the sides.

For race day or training? Race day is a minimal multitool, CO2 and the smallest adapter I could find, two tire levers, and a spare tube that I keep in a Ziploc bag with baby powder (it prevents the tube from having a hole rubbed in it while it is in my bag). For training, I add a second CO2, a patch kit, and carry a larger multitool.