Also; bandanas, trail mix, glow sticks, small Bible, tea bags, clothespins, sheets, inflatable pillow, purse-size umbrella, dental floss, maps.
An LED flashlight that uses a single AAA battery that will burn for 21 hours with 11 of those hours being regulated to give the same brightness as the first minute of fresh battery life, pretty much replaces the glow sticks which only have about a one or two year shelf life in a car.