For me one of the pleasures in having a paper-based system has been using my favorite fountain pen at my desk. Now I'm looking for a fountain pen for on the go. For notetaking, I have a small notebook (by Classic Diary) that has a pocket (like a wallet) where I keep a small ballpoint pen. I'd really like to have a fountain pen for it but it needs to be no longer than 4" with the cap on. Does anyone have any recommendations?