I have the Pelican case that I transport my C11 to dark sites in, the C9.25 OTA isn't much smaller.
To be honest, it's great when it needs to be indestructible - it hugged my 8SE (C8 and SE mount) in the hold of a plane from England and the collimation wasn't even out when it got to this end!
Besides that, I find it way too big and heavy. If you only need it for travelling in the car, you might want to look for something like an 80L plastic storage box and then pad it out with your own foam/padding. Would work out a lot smaller and lighter and much cheaper