I get multiple uses out of wheel boxes plus the local shops always have boxes available. In fact, I am sitting in a hotel room in SoCal and when I left NorCal, I took an empty wheel box and put a double wheel bag in it so the box had very little supporting infrastructure. I checked it is part of my luggage with Southwest. The box arrived in perfect condition and I am putting a front and rear disc in in the wheelbag and then put the bag in the box and check it in as luggage on my return trip. That is the way the wheel manufacturer shipped the wheels to me. One time, Southwest did not my wheels on the plane and they were delivered to my house the next day. However, a hard case is a great solution.