Empty out everything from your car but keep any safety items like jumper cables, flashlights or sun shield. Organize these items in a bin so they are ready when needed.
If you do a lot of shopping, organize your bags so they are easy to store and even easier to take out of the trunk. This simple trunk organizer from container store will hold grocery bags, maps and other small items so they don't roll around.
So make it easy on yourself and organize that car! Next project is the inside of the car!