Introducing ZenKraft's X-Treme Bi-Fold in distressed brown oil tanned leather. This notebook is revolutionary in design, as it holds two different size inserts. The X-Treme will hold four reg. size inserts and two Field Notes size inserts comfortably, in addition to loose papers, rulers, pens, small tech items in its three tech pockets, and one utility pocket. Definitely a "go-to" notebook, its the X-Treme Bi-Fold from ZenKraft.