The older ones were black with red thread. My Pono 8-string came in one of those. The new ones are brown - I liked the black ones better. I had a PSO and a PTS-E that had brown cases.
I now have my Kanile'a in a black O'ahu case, from MGM. Perfect fit and the case is just like my old black Ko'olau in construction, except no red thread (and slightly different dimensions as mentioned above)