Filson Rugged Twill XS Field Bag Black Harley Davidson Rugged Twill Backpack 90224GRAY Harley Davidson Rugged Twill Backpack 90224GRAY Filson Rugged Twill Backpack 5 Minutes with Joe Nylon Ripstop, Tin Cloth & Twill Backpacks & Dry Bags Filson Europe Harley Davidson Rugged Twill Backpack 90224GRAY. Sized to fit trimly in the center of the back, our Drawstring Backpack is a timeless design made with heritage materials. The lightly waxed Rugged Twill fabric is sourced from Englands historic British Millerain, pioneers in waxing cotton. The top opening cinches closed with a leather drawcord and cord lock. It's covered by a large rain flap. The Bridle Leather shoulder straps are backed by wide cotton webbing for carrying comfort. Our Bridle Leather has been slowly tanned in natural plant based solutions there is no finer leather.