It would make sense that the men who created sails since the 1880s could make such a durable Waxed Canvas Dopp Kit.  Wm J. Mills chose the toughest natural canvas available, the same that would bare itself to the salty winds of the Atlantic for months without a scratch, to make a practically indestructible bag.  The moment you touch this material, you'll get it, it might as well start growling at you.  

Made from #8 waxed cotton duck canvas, this bag is built for everyday rugged use. Sized perfectly for the traveling man (9.5" x 6.5" x 6.5"), it fits easily into your luggage. Designed with a slick brass zipper and reinforced bottom, this bag is waterproof, easy to clean, and almost as handsome as you are. Pass this down to your son one day...yeah, it will last that long.