Perhaps you are in Burma during monsoon season, or maybe a Louisiana bayou on a foggy morning, or simply just stuck out in Seattle's never-ending rain; regardless of the locale, it is tough to write on paper in wet conditions.  Standard notebooks and papers are not designed to be waterproof and generally bloat, tear or simply fall apart upon contact with liquids.

Jerry Darling developed Rite in the Rain paper for the Pacific Northwest logging industry in the 1920's, and it has been evolving since.  Unlike other water-resistant or waterproof papers, Rite in the Rain Universal Spiral Notebook paper is recyclable and the rugged Yellow Polydura cover made from 100% post-consumer recycled materials.  The 4.6 x 7.0" (11.7 x 17.8 cm) notebook has 64 pages (32 sheets,) weighs 0.24 lb (109 g) and has Universal page ruling, an example of which can be seen by clicking here. 

The paper works with most pens, but to ensure against ink smear consider purchasing the accessory All-Weather Pen (B&H Cat RIAWSP.)