They have launched their pen cases sometime last year and, yes I am late to the game, but I’ve picked up an Oversized (150mm) Pen Case in the seigaiha (waves) Kon (navy) colour. It is essentially a two pen case with a removable divider to make sure your pens don’t touch. It fits my girthiest pens, two Nakaya Piccolo, side by side without any trouble. It also fits my tallest pens, Pilot Custom 823, with no problems.
The case is well made, stitching flush and tight. Its frame semi-rigid, which helps protect the pens inside from impact. The pen case is secured with a button and has a fabric pull tab on the exterior for easy access to your pens. I personally do not take good care of my pen cases. After all they are there to protect and carry my pens, not be yet another item I need to baby. After using it as my solo pen cases for months, being thrown into my bag with other stationery without care, it looks as good as the day I’ve purchased it. The fabric exterior didn’t even looked like it is dirty in a way fabric tend to do.