This is perfect for a padded A5 planner binder. I have it on mine right now. It holds pens and pencils in even if you turn the planner upside-down briefly, even with some movement. It may make it harder to write, depending on which side you put it on, which side you write on more, and which surface the planner is on, but it's still easier than trying to write over a zipper pouch full of pens. It's a clever design and it's really well made.
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