When Teenage Engineering designed the pocket operators they had portability in mind over durability. That is not to say that the PO series are fragile by any means, but a case can have them lasting a lot longer. I recently stumbled upon beatmakers boutique, which make some high quality useful cases for the PO line. The MPC look is really cool to have with such a small device. Check em out at the link below.

https://www.beatmakersboutique.com/collections/specialty-items