Not a very organized kit, but I do have a flashlight, jumper cables, a first aid kit, plus pliers and screwdriver that probably won't be useful for anything that actually happens. Car has mini spare, jack etc. rather than an inflator can, but it would have to be really dire for me to change a tire myself anymore. I also constantly carry a medium weight jacket (desert nights can get cold even in summer), shop blankets (that may have been borrowed by my dad from the Ford garage when I was a wee one) and a broad-brimmed summer hat with neck flap, a bottle or two of water, and cellphone charging cable. (Actually, the new car has a wireless charging shelf.)
TPBM has come to the realization that their cell phone is probably the most useful car emergency gear for them.