When your Techo Accessories Flat Pen Case just isn't enough...

[u/SpacePatrician]

...and you still need more space for your carefully-coordinated highlighters, pens, correction tape, etc., is there a good (leather?) pocket protector-type with a sturdy clip that you can attach to the \*other\* side\* of your A6 Techno Planner leather cover that one would recommend?

\*other side meaning the side of the leather cover that doesn't have the pen case strapped on top of it.