I want to provide a quick update of last week's review of the Field Notes Expedition edition pocket notebook. Based on the recommendation of a reader (thanks Brian!), I tried the Sakura Microperm ultra fine pen. Think of a cross between a sharpie and a pigma micron. This is an excellent pen for the Yupo Synthetic Paper. It dries immediately. I've tried to get it to smear and it won't. The only drawback is that there's a bit of a "permanent marker" smell, but the point is so fine it shouldn't be too much unless you're super sensitive to that sort of thing.
I picked these up on Amazon in a pack of 3, which includes an 01, 03, and 05.
Update will be added to the original review as well.