Journals, Blank Books, Sketch Books
My sister claims that I'm the only adult in the world that uses Marble composition books. I've always used them, since about 13, when I first started writing. At the time, they were the only "blank books". I have dozens of them, filled with my changing handwriting and stars in the margins. I would also experiment with the other blank book available then, the black hardcover sketch books, found in art supplies stores.
Now there are so many different types of blank books and sketch books. I'm always on the lookout for the perfect one. Somehow, it matters, the quality of the paper, the size, the placement of the margins, etc. When I find a good one, it's as if the pen or pencil sinks into the paper without effort. Writing or sketching becomes so much easier, is even inspired.