Laura Borealis
I'm crazy about composition notebooks and have a ton of blank ones lying around, so that's always an option. But I struggle with how to keep the information organized when they're not extendable. For that reason I like the binder option, but they're so big!
You can get small binders, and paper that fits them. Do a search for "mini three-ring binder"
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I used to keep a tarot notebook (in a composition notebook) but I've lost it. It had notes I am totally bummed about losing, too - from old internet bulletin boards that are long gone (early to mid-90s), library books from other cities, etc. Totally irreplaceable. For that reason I feel like virtual journals are the way to go, but I've never really warmed up to blogging. Currently my notes are scattered throughout a few different notebooks. I need to rake them all together and start a new notebook (and make sure not to lose it this time.)