I'm addicted to the Circa system from Levenger for organizing, filing, and storing my analogue sketches and notes. I love how organic and adaptable it is.
The products are also very sturdy and attractive.
You can see multiple thumbnails for the Good Omens graphic novel in these shots, including the cover art thumbs above.
I use the Levenger hole punch to perforate my layout paper. It fits perfectly into the Circa notebook and can be removed and rearranged as I make changes to a project.
The Levenger Circa system is not cheap: I usually buy extra stuff toward the end of the year if I need a tax deduction. But you can often find amazing bargains on ebay. I've saved 80-90% on a few items. Takes some time to hunt for those, but can be worth it.
The Canson Layout paper is my favorite. It is acid free, heavier than some other papers, and has a bit of tooth. Pencil shows up a bit darker than it does on slicker, lighter paper. Easy to find, here's a link with more info and you can also order here.
Dammit, Colleen, I stopped buying art supplies so long ago and now I really want these. It’s enough to make me want to pick up a pencil again.
And this after I just bought my yearly supply of sticky note pads…