Bingley: I drive a sm/./med. SUV crossover. I've always kept a 2.5 lb. ABC fire extinguisher under my driver's seat, held in by flapping the rear mat. The higher floor side walls and seat bottom form the rest of the "box". I've been in several unavoidable crashes over the last many decades and it's never been dislodged, albeit none were rollover crashes. I like having it accessible to the driver in case he/ she is trapped in the burning hulk, after a crash. P.S. Get one with a metal tip .