I bought a cheap Performance one when the bike and I drove to a conference last year. It worked well for keeping everything corralled and keeping the grease out of the rental car.

I did ask my shop for some of those packing spacers that are used to protect the dropouts on boxed new bikes, and I bought a cheap eggcrate foam mattress pad that I cut up and put between each wheel and the frame.

If you're travelling by car, and will have control over the bike all the time, a soft case should work fine.