while I am in the middle of optimizing my gear, I thought about the ideal pen for logging. So far, I mostly use simple pencils, for they work in almost any weather.
Fred KT5X mentions the Mini-Spacepen, but I could not find the exact model, and they are pricey (40 USD or so).
Among geo-cachers, the Inka Mobile Pen seems popular:
However, some reviewer complain that the new version is mostly out of plastic and less sturdy than the initial one. It is ca. 15 USD.
Another option are the Rite in the Rain pens, like this one:
Then there are multiple power tank pens, like this one:
What are you using?
73 de Martin, DK3IT