Muji Planting Tree Paper notebook (B5) is surprisingly good with fountain pens. Great for rough work, practice, etc. Got different kinds of Muji notebooks to see which ones work well fountain pens
Hierarchies of Fountain Pen Friendly Paper (Last Updated 2.18.22) — The Gentleman Stationer
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A5 Notebook - Leather Bound Blank Journal w/ Tomoe River Paper - Galen Leather
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The Paper Mind Passepied Cream Hardcover Notebook For Fountain Pens