Pocket notebook, journal, and folio.
Mont Blanc Hemingway ballpoint, purchased at Bertram's Inkwell, White Flint Mall, Rockville, Maryland, 1992.
I've carried this pen almost everywhere for over twenty years. Almost lost it twice. It's been chipped, cracked, and once lost its clip, but always restored by Mont Blanc.
A pocket notebook for notes on-the-fly, a journal for detailed scribbling over morning coffee, and a folio for writing longhand.
Nothing beats a good pen and paper.