High Sierra SBT Slim Backpack 400 Denier Nylon - Nylon is a high strength, durable material with excellent wear properties. The term " denier" (D) refers to the size of the yarn used: the larger the denier the bigger the yarn. Free Shipping on All High Sierra Orders. 1.50 pounds Exterior Dimensions: 18.50" X 12.50" X 7.00" inches