I play a bit with both leather and Kydex , since I discovered fountain pens , I have come to enjoy using better quality note pads , they need some way to protect themselves from the rigours of the jobsite . Leather is great , but can be problematical around wet enviroments , and doesn't like abrasive substrate .
As a result I made a Kydex cover , it rides comfortably in the back pocket of work pants . It is actually fairly comfortable when sitting . Their is a kydex front pocket for things like scales and protractors , the pad holder acts as a clip for reciepts etc .
Chris