Just bought a 2nd mat, for the 2nd car.  Many have indicated that they will use this for the beach.  Its also great to put in the car / SUV for any time when you need to pack things that will put dirt in your trunk or seats.  Xmas tree, plants, anything sticky ( kids ) or dirty.  Also very useful if your car ever has a flat tire to use as mat to change the tire - I have used it twice.  Once to change a tire (saved my work clothes from the muddy street) and the other time just to put it down to look under the car.  Big enough to lay on, but folds small enough and neat enough to fit in trunk without taking up too much space.