Over the years I’ve talked about Muji paper a bunch, and one comment that kept popping up was: “It depends which Muji paper you get.” And… yeah. It absolutely does. So in this video I put three different Muji notebooks side by side—one made in China (basic B5 notebook), one made in Indonesia (double wire notebook), and one made in Japan (the loose-leaf style I personally use the most)—and I ran the exact same pens and tools across all three to see what actually happens with fountain pens. I used a JinHao X450 (medium), a Pilot Kakuno (medium), and a Gravitas Micarta (broad), plus a couple of fineliners, a Jetstream ballpoint, a Zebra Clickart marker, a Sailor Shikiori brush pen, and pencil—then checked both the front and the reverse for feathering, bleed-through, and ghosting. The made-in-China notebook is usable, but it’s the weakest performer (some feathering, and the reverse really doesn’t hold up). The made-in-Indonesia paper is a clear step up—cleaner colour, less feathering, and you can actually use both sides most of the time. The made-in-Japan paper is the premium experience: smooth, no feathering with fountain pens, and much less ghosting—though the more aggressive marker/liner stuff can still come through. The takeaway is simple: don’t assume “Muji paper” is one thing—check the country of manufacture and pick based on performance, price, and the notebook format you actually like using.