Filson Rugged Twill Original Briefcase in Navy. Constructed from rugged twill, chosen for its exceptional abrasion resistance. This industrial-strength fabric comes from Britain’s oldest mills and is lightly waxed to keep valuables dry and protected from the elements. The strong and durable Bridle Leather handles extend underneath the bag to cradle the heaviest loads. The rustproof heavy-gauge zipper is built from solid brass and is reinforced with more saddle-grade leather. Finished with custom debossed sand-cast brass hardware.