Rite in the Rain field-flex notebooks are tough, resilient, and flexible. The weather-resistant and archival-grade paper resists stains, survives moisture, and lasts for a lifetime in storage. The unique field-flex cover material lets mud and water roll right off, protecting your notes in adverse conditions. Field-flex also flexes easily and springs back into shape - these will easily pack into a cramped field bag and won't be any worse for wear. If it's worth writing down, it's worth protecting on Rite in the Rain paper - defender of your notes against the elements since 1916.