I have multiple journals. But sometimes it does get confusing. My first journal is a daybook where I capture whatever random thing be it a shopping list or a quote I like or a personal epiphany. The second journal is a diary type of journal and this is where I write out my thoughts at length and deal with emotions.
Then there are my notebooks and binders. These are separated by topic such as "creativity," "life lessons," "books read," and "writing." Because this method took up space, I went ahead and started transferring information into Evernote.
This has been fun to think about! What a good topic....