Orvis Pro Waterproof Roll-Top Backpack 20LThe PRO Waterproof Roll Top Backpack 20L is constructed from 840 denier, abrasionand puncture resistant ballistic nylon and coated with . 1mm TPU on both sides of the fabric. If there's a more waterproof and thoroughly seam sealed pack collection on the planet, we've yet to see it. Twenty liters of storage give you ample protected space in this Roll Top for fishing gear, a jacket, and a PB&J sando or three, now in a stripped down version that does