Cabelas sells a case (believe ICC makes it) that can take two breakdown double shotguns or rifles. I have not used it myself.
Noticed that the Americase website sells a velvet interior case that fits two breakdown doubles. But the foam interior case only advertises that it is for two breakdown pump or auto shotguns (looks as if it would handle sxs doubles, too. Anyone have any experience.
I have used an ABS velvet lined case that takes two double rifles/shotguns broken down with no problems on two trips to South Africa. It's fairly light and compact without being flimsy.
Regards