Art supply question: Notebook with removable facing pages?

Hope this is the right place to ask this kind of question!

I don't know much about notebook making but I have used this kind of book in the past and am wondering what the term for it is. It's a threadbound book of pages where every other set of facing pages is one continuous sheet, so theoretically you could draw on every other set of facing pages in the notebook and then if you removed the thread it would just be a series of folded square drawings at the end.

I think the version I used was made by traveller but I would love to know if there are other brands like this- I draw on the subway but would like to have something in a square format that I could selectively store separately and maybe even frame when I'm done using the notebook.