I used a duffle bag...and one of those fancy "tactical " bags....
but the best bag I have found for the nero is the box it came in...It just offers more protection...plus room for radio and parts stored between the wheels and all over....
I use a wheeled duffle bag that holds a complete truck with tires on, the remote, extra set of tires, duel charger, extra batteries, spare parts, and tools. It works great!