Field Notes notebooks are among the best notebooks currently made. Good quality paper, fits in my pocket very well and are just a pleasure to write on. Sadly, the paper cover doesn't stand up well to minor abuse. A cover is needed to give some protection.
Field Notes make a couple of leather products to fufill this requirement but given that they are at the \$80+ price point I decided against one of those. Far too much money for a few bits of leather stitched together. Ebay was the same.
My buddy Drayygon has been doing a few bits of leatherwork for a couple years now so I asked about the possibility of commissioning him to make a cover. For the princely sum of £15 I am pleased.
It is a simple affair with 3 leather panels stitched together to hold the cover to the notebook. No faff, no extra guff.