Cleverness of this specially designed Kokuyo Pastel Cookie pencil case is that it is expandable. The minimum thickness of it can be as small as 27 mm when fully compacted. However, when you unzip it, it can expend up to 67 mm thick, allowing you to put much more stationeries to carry with you. Inside, there is a special flappable layer which you can clip pens onto. Also, it is made of polyester which is durable and washable.