Survival Skills 101: BASIC Car First Aid Kit
This is what I carry in my Jeep First Aid Kit. I focus on first aid for camping. I was out camping 32 times last year. Yours might differ depending on what your goals are.
You should always have a car first aid kit along with some latex gloves, bandages and band-aids. I have a smaller first aid kit that is easier to get to in case I come across a car accident.