I have an oversized Babylock Serger rolling zip bag that I can put my Brother Innovis 4000D in. It isn't padded, but by the time I put the zip locks in with my fabric & sewing needs...scissors, thread, etc, everything is padded nicely. It's even big enough to put a 12x18" cutting/ironing board in. A bit heavy to load, but wonderful to wheel in.
I would Never ship my machine in this bag. I would buy a Tutto if I had to ship it. The Tutto keeps a machine a lot more stable and has a protective pipe like exterior frame.