Best fit and lightest bag i found for PA900 is RoadRunner 61 from GC.
You need to stretch it a bit a few times to snug fit the kb.
_________________________
Jim
SD90,Korg I3, KMA Liverpool,TC Helicon Play Electric, Fender Sonoran Guitar, vArranger, Bose S1 Pros, Bose L1 Compact, Aiwa Exos-9