Relatively expensive, but worth every penny. This is a serious piece of kit, made out of heavy duty nylon with a cordura base. I currently own an 80L model which is more than capable of storing an entire set of winter paddling kit, inc. throw bags etc, etc… Probably no different to many other bags except carrying all that kit can be a pain. The NF bag comes with two well padded rugsack type straps which allows the bag to worn rucksack style. This is extremely comfortable as the bag molds to the shape of your back.
A standard set of carry handles and hauling handles either end compliment the set up. In addition compression straps are provided either side just in case. Inside the bag is a mesh pocket on the inner of the lid with a deep set of pockets situated at both ends of the main compartment. The build quality of the bag is second to none with all seams double stitched and bound. This also makes the seams pretty waterproof although they are not taped. I have had no problems with excess water from soaked kit getting out of the bag.
My bag has survived five years of constant abuse and airline baggage handlers with no significant sign of wear. The only real negative I have ever found with this bag is the price, but they do say you get what you pay for.
North Face have also brought out the new Water Duffelo – designed specifically for water sports.