Reddit mentions of Kokuyo Campus Smart Ring Binder - A5 - 20 Rings - Clear [Office Product]

Actually, I have an idea, not sure if this is the one you're thinking, but I really like the Kokuyo Systemic Notebook! https://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3Daps&field-keywords=kokuyo+systemic

I have it in the A5, and if you have a Cousin Avec, I believe you can have it in there along with Kokuyo's Smart Ring notebook (https://www.amazon.com/Kokuyo-Campus-Smart-Ring-Binder/dp/B00BLYJ8LQ/ref=sr_1_1?ie=UTF8&qid=1536011201&sr=8-1&keywords=kokuyo+smart+ring+a5) I'm not sure if it can fit the non avec version though. My current system has an A5 sized Rhodia dot pad on one side, a Smart Ring notebook on the other, AND, there's still room for one more notebook in the back (which is where I plan on putting my Cousin Avec when I get my paws on one!!).

The Smart Ring notebook is really cool. It's a binder system that's really easy to open and close and you can buy the refills and print on them if you like. I think that hit all the points you were asking for? I know I sound like a Kokuyo salesperson, but I just really love the system is all XD Oh, and guess what? They even have an A6 size ;) (for the cover, but I don't think for the Smart Ring notebook though).

If you have any questions, feel free to ask!