I brought the new 20L Amphibian Weather Defense Backpack on an extended fishing trip and before I knew it the other three anglers on the boat had stuffed it with their wallets, cell phones, car keys and a change of dry clothes. The waterproof bag swallowed everything up and kept it all dry, even after leaving the backpack on deck where it got doused, knocked around and stepped on.
The 420 Denier Fabric with TPU coating is supple enough to feel comfortable on your back and rugged enough to endure a weekend's worth of saltwater spray. The backpack straps are easy to adjust and distribute the load in comfort while you wear it. I particularly liked the top grab handle, which I used to convert the bag into a carry-on for the flights to and from the fishing locale. The zippered side pockets are a tad small, but as a bonus the trekking pole holder--this roll top is designed primarily for hikers--can hold a fishing rod.