I used these items during my last travel. Quite optimized but not fully ultralight kit.
Current notebook (blue one), auxiliar notebook for fast notes, agenda, etc. (red one), wooden box with writing tools and fabric bag with spare pens. Some day I will show the tools inside.
I found this setting quite confortable. Wooden case is a kind of ritual. Opening it means start writing.
And this is my portable studio. Every day different views.