Two adults will just about fit in the rear of the Cabriolet if those up front aren’t too tall. However, they’ll still have their knees pressed up against the seats in front. Rear head room isn’t great with the roof closed either so, unless the sun is shining, the rear seats are best left for children.
Irritatingly, the optional wind deflector is a large contraption that you have to erect across the rear cabin. With this in place, the A3 Cabriolet is strictly a two-seater.
Like other cars of its type, there is very little scope for oddments storage in the rear. The A3 Cabriolet really does put its front occupants first.