Everything you need to remove a tire. Also need to maintain the spare. It’ll deflate over time and you don’t want to open up to find a half inflated tire.

Optional: reflectors/flare, inflator, battery jumper, disposable plastic poncho, plastic gloves, tire plugs, headlight

And a means to hide the extra stuff. I used to keep it all in a bag and someone broke my window to steal it. I know now, as an adult, people suck. I keep it all in the spare tire compartment now.