Do you keep your used notebooks?

I don't mean notebooks that have been used as diaries, travel journals, planners, etc. I mean things like pocket notebooks that you scribble to do lists in, errands, random reminders, names of movies you get recommended, etc. I have a passport TN that I currently use for an external brain dump and I'd hate to throw that insert out once I'm done mostly because it's a nice quality notebook, but I also don't see the point in keeping a book filled with random scribblings that aren't really important or that I don't need to refer back to.