I carry two tubes when I ride but that’s because all 3 bikes I ride (2 singles and a tandem) have 20”/406 F and 26”/559 R wheels. Emergency kit includes a Road Morph pump and self-adhesive patches. Very few flats due to good luck and tires with anti-puncture features. Did suffer a pinch flat with sidewall damage a few months ago - wasn’t paying attention and hit a nasty spot of concrete road surface decay that I knew about in a nearby neighborhood.
Not expecting spouse’s e-assist Trek to flat since putting new tires on it - Schwalbe Marathon e-Plus which seem way over the top.