PORTER Porter Tanker System Binder Size (Measured flat, approximate): W: Approximately 22cm H: Approximately 15cm D: Approximately 4cm Compatible with B6 6-hole planners. The binder section can be removed, allowing it to be used as a 2-way pouch. Although unused, it has been stored at home in a dark place for a long time, so please refrain from purchasing if you are concerned about this.