For years I carried a little paper notebook (usually Field Notes) in my pocket along with my iPhone. I don't do that much anymore. At the day job I still carry a pen and notecards in my breast pocket—which are useful for sharing—but after hours I'm no longer with paper. This shift wasn't intentional but instead a gradual thing as I became more smitten with Drafts. It just isn't that much more difficult for me to tap a quick note into Drafts and carrying less always feels better. If you are on the fence about this, the gang at DODO just released an interesting notebook with a sort-of iPhone nest built in called DODONotes. A year ago I would have probably tried one but right now, I'm good.