Since this seems to be something Casady bass owners are looking for I thought I'd report that the Jack Casady bass goes into a stock
Mooradian electric bass gigbag. It's a snug fit but not a struggle and there's no undue strain on the zipper. With a very small amount of fussing the padded flap that protects the instrument from the zipper can even be pulled into place. A very slightly used stock hardshell case will be up for sale shortly.