I use a car bike rack that attaches to my hatchback Toyota Matrix. I can get one bike inside if I needed to; but it's just a lot easier to put it on the rack, and if I need to carry more than one bike, then the rack is a necessity. The worst thing about the rack is that the bike gets dirty riding on it. I lock my bike to the rack to ensure that it could never fall off and to prevent any easy opportunity theft while I'm not in the car.