filson’s commercial-strength rugged twill from british millerain is a 2-ply through three-ply twill with awesome resistance to abrasion and put on. It’s lightly waxed, so your valuables live dry. The leather-based handles and straps are cut, burnished and side-dyed in our seattle factory from bridle leather-based hides vegetable-tanned by pennsylvania’s iconic wickett & craig. Every hide is slowly steeped in a special bark-tannin solution, with tallows and waxes “hot-filled” into it at some point of the very last ranges. This eco-friendly tanning process transforms cowhide into long lasting, pliable leather suitable for horse tack, saddlery, as well as filson briefcases. The heavy-gauge brass zipper is rustproof, surely indestructible, and strengthened with bridle leather. All of this is stitched collectively with heavy-duty, cotton-wrapped polyester thread, to make certain a briefcase in order to offer a long time of unfailing sturdiness.