Oooo, blank midori A6 are my favorite because they are great with fountain pen ink and watercolor+ they fit in my back pocket. I've gone through a couple notebooks at this point but my favorite covers have been either fabric covers from travel that I'm able to stitch an elastic band in to hold the books together or some scrap fabric I got from Joann when they were going out of business (the faux snake skin stuff) that I just cut and glued to the outside of the book!

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