In this video, I review and compare the 5 most popular Clairefontaine staplebound notebooks. These include C3586, C63596, C3606, C381 (S_ys/French ruled!), and C63125. I do a writing test comparison between a small Mead Composition notebook and the C3586 (3"x4"), and there really is no comparison! The 90g smooth Clairefontaine paper in these staplebound notebooks is really some of the best writing paper in the world, especially for use with fountain pens.
I briefly introduce S_ys ruling, otherwise known as 'French Ruling', on the C381 (6 3/4" x 8 5/8"). Enjoy this video, as it gives you a good size comparison of the different notebooks, as well as details about the rulings and colors available.