One of the frustrating things about keyboards is that they come in all shapes and sizes, and so we need to find cases or bags that fit. I've frequently found over the years that Groove Pak bags might fit pretty well where other cases and bags do not. And the 61 note bag might fit a 73 note keyboard, or in my case, the 76 note bag fits my 88 note Nord Stage pretty well. Bags are not cases, but a bag can be reinforced, or the keyboard wrapped protectively. I 've found this to be an acceptable compromise when I'm playing locally and moving my own gear. It keeps the weight down and is decently protective. If you have roadies or are 'on the road again' you'll need a hard case.
Long Island, NY