It was really tough to find a soft case/shoulder bag for a 000- sized Martin and I took a chance with this Thomann branded one. The case, however, is really good, very thick padding and comfortable to carry. And it looks pretty nice even! It came with a little pedalboard case that straps on as well!
One thing I don't like much about it, though it's no real problem, is the latch system to close the big back pocket, it's a hook that slips onto a loop rather than a real latch to close it. No biggie though, it seems to stay closed.