I'm off to DC tomorrow morning which coincided with reaching the last page of my pocket notebook. I have been using the current book since late March so I am a bit surprised at how intact it still is. I try to be a shirt pocket carry kind of guy but it occasionally makes it into the back pocket of my jeans.
For Field Notes, I only like to use fountain pens with the editions that have the 70# paper. I do have a few of the 50# books around and these get funnelled into projects were a fountain pen is not going to be used i.e. in the workshop. So far the paper in this "Workshop Companion" hasn't liked the Schmidt P8126 refill in my Retro 51 so I will have to try a different pen with it tomorrow.