I bought an old Samsonite (Hard Shell) Suitcase for like $20 at the thrift store. They come in pretty huge sizes but honestly I would prefere like a pc case + and accessories case.
I used to use one to carry my dj controllers, rog laptop, a monitor (broken laptop screen), monitor speakers. And I can assure you two cases would have been better as that thing was sooooo heavy and unwieldy (it actually broke the whole suitcase eventually)
Worked great with all the spaces filled in with my clothes for the weekend. Any hardshell suitcase big enough should do the trick. Good luck.