But its not a wagon. There is not "storage" behind the rear seat. There's a foot, maybe two, of room, thats not storage, thats leftover car. Storage would be a big enough area to put a few large dogs or 4+ large pieces of luggage, not just a set of golf clubs or a few bags of groceries. Thats why the pic JLee posted fail as wagon status just like this.
My dad owned two wagons, the above mentioned Mercury wagon and then a subaru GL wagon that was truely a long wagonish car.
This is a wagon
http://upload.wikimedia.org/wikipedia/commons/c/c1/1988_Subaru_GL_Wagon.JPG
Edit: Compacts cannot be wagons either.