Ideal to keep you prepared to battle the elements, the Filson Dry Backpack is engineered for waterproof protection. Crafted with an 840 denier nylon tarpaulin fabric, with thermostatic polyurethane which water can simply not get through. Ideal for life on the trails, or your daily commute to work. Green 840 Denier Nylon Tarpaulin Fabric Breathable Back Panel Waterproof Roll Top Closure Expandable Mesh Pockets Filson Dry Backpack Green