8. Blanket
Even if its summer time, when my daughter gets sleepy she likes to have a blankie next to her face to go to sleep so I try and keep one in the car to propel her towards a nap. At night it cools down low enough to toss one over her in the car, and sometimes you find yourself in need of one to relax at the park. You won’t be sorry you have a blanket in the car, and it could even come in handy if you find yourself in an emergency situation.