Some New Information
No, this isn’t a mistake. Melz, a fantastic reader, submitted a comment with so much wonderful information, I asked their permission to post it as an addendum to my Plotter alternatives series. You can find even more information about “system techos” on Melz’s blog.
I have only slightly edited the content below to make it flow well (like adding headers). Where I have edited the text (as opposed to just rearranging something), I’ve placed it [in brackets]. Please don’t grant me credit for this knowledge, it comes from the fantastic brain of Melz.
While Plotter markets itself as a leather binder, it is completely categorized as a “system techo” (システム手帳) in Japan. If you throw that into your preferred search engine, you will start to see more relevant results in terms of matching binder sizes and refills.