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I have a Cronkite bag I purchased for my Kanstul 66. It happens to fit my 1912 Martin. I also have a hard case for my Kanstul again fits my Martin. As it turns out, my Martin uses the hard case more and the Kanstul stays in the bag (mostly).

1 bag
6 tuba's
OK, I do have another three bags I can also use, but unless I'm playing with two horns I just take the one. It's the best bag and it's adjustable.

And a sleeping bag works in a pinch.

I use my Cronkhite PT-6P bag for my W900, Mack 186 Clone, and my Conn 2J. Although the fit gets progressively looser, it gets the job done and I only am dealing with relatively short walks from the car.