I prefer taking notes one-sided on loose sheets; unlike a bound notebook, you can freely insert, remove, and re-arrange pages. Taken directly from the zettelkas

I prefer taking notes one-sided on loose sheets; unlike a bound notebook, you can freely insert, remove, and re-arrange pages. Taken directly from the zettelkasten concept, I date each sheet for a unique identifier, and then notes in a series are numbered hierarchically, so that, for example, a page inserted between those numbered #1.1 and #1.2 would get the number #1.1.1 ; for storage, I staple or clip my stacks and stash them in a hanging file. For writing on the go, steno pads integrate well into this system; when I fill up a pad, I (eventually) unbind it and re-file the pages as if they were loose sheets.