Good dry bag, toughness a little exaggerated
I'd say that these are a good compromise between nylon bags and the heavier pvc ones like those that NRS makes. As others have said, they're too heavy and stiff for backpacking, but they're great for canoeing and kayaking. Lots of people are saying that these bags are really tough; I'd say that they're pretty abrasion resistant except that they develop weak spots under the stress of creases / tight bends in the material. I actually put a hole in one pretty quickly by jamming it (somewhat violently) into the back of my playboat. If you treat them a little more gently, they hold up.