Just about everyone on the web describes the OEM Harmony case as "chip board". This is an incorrect appellation. The word "chip" connotes some form of wood, whether solid or in chip form.
However, no solid wood or chips were used in OEM Harmony cases. They are 100% cardboard.
I would not bury the cadaver of my worst enemy in one of these cases. But, they are OK for shipping if thin foam padding is added.
A great guitar should have a plush hard shell case.