I have to carry the keyboard up and down flights of stairs frequently, so a case with backpack straps for the CP73 would be pretty useful for me. I haven't had much luck finding one at the moment besides potentially this case: https://www.gatorcases.com/products/keyboard/pro-go-ultimate-keyboard-gig-bags/pro-go-keyboard/61-note-keybaord-gig-bag-g-pg-61/ with interior dimensions 42.5" x 17.5" x 7". However the CP73 dimensions are 42.75" x 14" x 5.6" - very slightly (a quarter inch) longer than the dimensions of the case. I have not tried the case personally though, so there may be a chance that the case actually does fit.
I'm just wondering if anyone has experiences with this case or any other case that has backpack straps for the CP73.