We're not sure where it started, but so many sketchbooks these days are tall and thin.
Out of all the things we discussed with thinkers around the world, this was one of the major gripes about today's premium sketchbooks and notebooks. Unless you're using the full spread, the tall proportions make the pages difficult to work with, especially when holding the book with one hand.
So we took some of the extra vertical space and moved it over the the side. Now you can hold the book with one hand while on the train, park bench, or couch and have more breathable and usable space on a single page than ever before.
Add to this the fact that our books open flat and you can understand just how fully each page is available to you.