Pocket Notebook with Graph Paper

I'm a Field Notes convert when it comes to pocket notebooks. Carry mine inside of a reasonably thin Davis Leatherworks cover to keep them from getting Ass Shaped from me sitting on them all day. America the Beautiful edition is still available and uses some paper that holds up well to fountain pens in my use. Grid patterns on FNs are 3/16" I think.

I've also been known to keep a Rhodia No11 in a shirt pocket in the past, or the 3.5x5.5 rhodia webnotebooks with the soft touch hard cover.

I generally prefer the FNs because they are thin enough that I don't feel them in my pocket in most cases, and at 48 pages, I can usually fill them up before they fall apart. They are also fairly reasonably priced at $10/3 pack (So long as you don't get sucked into collecting all the limited release ones that came out in the past. A 3 pack of the first "Special Edition," which are priced at the same $10 direct from the manufacturer as the rest of their books, recently sold on ebay for $410. Thankfully, I'm not a collector. I buy the special editions when they are released if they tickle my pickle and they're only $10.)