This is Rite in the Rain No. 6511 DuraCopy copier paper: 100 white 4.7-mil synthetic sheets, 8.5 by 11 inches, that run through laser printers and copiers on both sides without melting and hold toner through soaking and abuse.
It produces dive slates, river maps, emergency procedures, and field forms that survive being dropped in water outright — and it still cuts, perforates, and hole-punches like standard office stock. Use pencil or all-weather pens when wet; water-based inks wash off.
Rite in the Rain has made all-weather writing paper in Tacoma, Washington since 1916, when it was developed for logging crews in the Pacific Northwest.
