A pen case that fits a field notebook

A pen case made from 100% cotton No. 10 paraffin-coated waterproof canvas. **Regarding the water repellency of the "Pure Cotton No. 10 Paraffin Waterproof Canvas" used for the main material:** https://www.youtube.com/shorts/Lfetja_Lu2g This material is highly durable and may feel stiff at first, but it softens and conforms with use, allowing you to enjoy its __aging process.__ Products will have creases (white lines) from the sewing process. This is an inherent characteristic of the paraffin coating and not a defect in the fabric. The zipper is a __YKK 3 coil__, and the __elastic cord, which serves as a design accent, is also a reliable industrial component__, ensuring __long-lasting quality__ without easy deterioration. https://live.staticflickr.com/65535/54795476673_31865fa1bb_w.jpg The product measures a __practical__ 20cm in height and 13cm in width when folded. The two zippered pockets on the left are free spaces, perfect for accessories like erasers or pencil lead cases, as well as for neatly storing items like a 16cm ruler. The right side can hold up to two field notebooks (also fits A6-sized notebooks). **Note: The notebooks and stationery, such as pens, shown as storage examples are not included.**