"Book" brand laptop bags?

On a recent trip, I saw a woman with an adorable laptop bag so I asked where she got it and she said, "off a website called 'Book.'" So I've looked all over and tried many different search terms but came up with nothing. Has anyone ever heard of such a brand? The bag looked like a regular neoprene laptop sleeve, turned on its side, with a messenger bag type strap. It was very sleek and simple.