Our new “Expedition” FIELD NOTES are pretty close to invincible, at least by notebook standards, but waterproof paper is nonporous and doesn’t soak up ink like most paper. That’s good in some ways (no bleeding, feathering, or show-through), but it does limit the writing implements you can use. Regular ball-point pens and pencils work fine, but pens that lay down a lot of ink, like fountain pens, rollerballs, and markers, don’t dry as quickly, and may smudge and/or come off on the opposite page (as seen in the last example in the photo). Fine tip Sharpies also work well with the Yupo paper.
Your “Expedition” 3-Pack is wrapped in a bellyband made of the same Yupo paper that’s in the books, so (after trying to tear it!) you can test your pens there and see what works best.