Dinavio Crafthouse PET Plastic ETB Protector Case 10 Pack - Elite Trainer Box Protector - ETB Case Compatible with Elite Trainer Boxes (Pack of 10)

I put my opened ones in the same type of protectors they make for funko pops. You can get a 10 pack on amazon for $20. https://www.amazon.com/dp/B0DNSHR7JG