Looseleaf for outlines. I also have some smaller binders that take smaller paper, and I keep extensive notes for novels in those books.

I have a couple journals (one general, the other about specific things) that are moleskin hardcover books.

I have an agenda to write my tasks each day.

Index cards for notes about books and stories.

I carry around a moleskin booklet for ideas when I'm not home. I used to get cheap knockoffs from walmart but can't find them anymore.