Your glove box may be your first line of defense in a car related Emergency.
The Key is to plan ahead. I'll assume you already have a 72 Hour Survival Kit in your vehicle but you can't reach it yet. Perhaps your belt won't release, or you are hanging upside down.
The first item is gloves. In a crisis, you want to protect to hands from the weather and cuts. You may be about to use a knife to get free.
The Second Items is a knife or multifunction tool - IF you don't wear one or as a back up.
Step 1: What's a Survival Blanket among friends?
* If I'm unable to reach my 72 hour bag, I can reach the one in the glove box.
* If I'm sharing the car with a guest, we would each have a blanket.
* If there are people in front and back seats, each area would have a blanket to share.
Mylar blankets are light weight and inexpensive but they retain 90% of your body heat in a good situation.
BEWARE around fire. This is for a last resort Survival Blanket, sun or rain protection, but mostly to save your heat. Even Deserts are cold at night.