I love my Maruman Mnemosyne 105 (not the 182 which is single sided) notebooks (I've been using them for years). The great thing about them is that the paper is

I love my Maruman Mnemosyne 105 (not the 182 which is single sided) notebooks (I've been using them for years). The great thing about them is that the paper is thin but there is no bleed through even with fountain pens. They're also much more practical for ideating than a Leuchtturm because they are perforated for tearing off. With a Leuchtturm there is a hesitation to write because you don't want to waste paper or mess up a nice notebook, but the Mnemosyne there is no such hesitation (even though it's nice paper). https://www.jetpens.com/Maruman-Mnemosyne-N105-Notebook-A5-Dot-Grid/pd/27112 https://www.jetpens.com/Maruman-Mnemosyne-N105-Notebook-A5-D... Also, although I've been a fountain pen enthusiast for years (LAMY, TWSBI, Pilot), I find I can get the same quality of writing from a inky rolling ball pen like the Pilot Precise V5 RT. They're much cheaper and easier to carry around than a fountain pen. https://www.target.com/p/pilot-3ct-precise-v5-rolling-ball-pens-extra-fine-point-0-5mm-art-deco-collection-black-ink/-/A-13317289 https://www.target.com/p/pilot-3ct-precise-v5-rolling-ball-p...