If you want to be more prepared, check out this awesome vehicle everyday carry list that will help you tremendously if you find yourself stuck in a situation where you only have your vehicle.
Chances are you will have your vehicle in an emergency; this also enables you to hold a little more than a bug-out bag can.
The list was compiled by JJ, a former USAF Survival, Evasion, Resistance, and Escape (SERE) instructor. Check it out.