I bought the 180cm. bag. This is very long, like for skis, but is also just the right length for a snowboard with boots at the bottom. If you overlap the boots and board, a shorter bag would be better. The bag's bottom stiffeners are too short, allowing the bag to bend at the end of the snowboard. This allows the bag to drag if you are trying to roll it. I basically had to carry it everywhere, from airport baggage claim to rental car.
Domestic airlines only allow 50lb max weight. You can easily go over the weight limit if you're not careful. It's a big bag!