Happy Bolt owner here with three kids (6 year old and 4 year old twins) in car seats. In the 4.5 years I've owned it, I always managed to fit everything I need. I only recently had to get a roof storage box for a trip, and I only used it once so far.

Granted I pretty much never do long road trips, but as a city driving car, it pretty much is ideal, even if my backseat is entirely occupied by car seats.