Underway again this week with my Bexley Jitterbug (Noodler's Bad Black Moccasin) - for official-work-type stuff; but I'm also packing my Pelikan 605 (Uroshizuku Asa Gao) just for fun.
Several sitting on my desk but the one that got used so far is a Lamy 2000, Medium Nib, with Parker Quink Black. Not my favorite ink, but it helps tame the firehose ink flow of the Lamy!
Writing instrument is a rotring Rapid Pro ballpoint and I have a Field Notes Expedition in my side cargo pocket. I wish I could find a non-clicky pen that would write as nice as the Rapid Pro, the nicest ballpoint I have ever used.