I replaced an unknown number of physical notebooks with a iPad + an Apple Pencil + Apple Notes app. It's definitely not quite pen and paper, but I can refer to

I replaced an unknown number of physical notebooks with a iPad + an Apple Pencil + Apple Notes app. It's definitely not quite pen and paper, but I can refer to 1000's of pages in an object the size of moleskin-like journal. I don't have email or messaging on the iPad — it's just for reading and writing. If it's something that doesn't require a sketch, I just use a plaintext document.