These I discovered through Dave Van Ronk. But like Calton, Blue Heron makes each case to the exact specs of your instrument, and while it's lightweight, its padding and stitching are constructed in such a way that the instrument doesn't shift around inside. Van Ronk's is black and purple. Mine is teel and linen. The outside is lint-free Ripstop Nylon and waterproof 1000 denier Cordura.
Colors are royal blue, purple, teal, linen, and black.
Or write to them at Blue Heron Enterprises, PO Box 270, Carlotta, CA 95528. I love my new case so much it gave me the idea of writing this up for you. By Unbelievable Coincidence . That nailed it for me. I knew I had to pass this information along.