One bike's tool bag has a CO2 inflator, the other two share a Pro Bike Tool mini pump. Each has a multi-tool. My old racing bike has a 5.5 mm or 7/32" Allen key for its seat bolt in the tool bag, plus an 8/10 mm wrench for its old-fashioned nuts. I'm relying on sealant for it at present, but carry spare tubes and tire irons on the other two.
Tool-kit lite
For myself, I add my asthma tooter, a handkerchief, and a mask, these days.