Here's the scene: I've got myself a brand new camera and this brand new Quantum Camera Pack. I'm off on a weekend in the Berkshires with friends. I leave the pack in the car, so nothing will happen to it. Someone decides to be "helpful" and, thinking I've left the bag unintentionally, moves the bag (with brand new camera) from the safety of the car, to the exposure of the field. When the thunderstorms hit, all I thought was how glad I was that my backpack was safe and dry in the car. When I went to find it, I was certain my camera was done for.
As it turns out, the water-resistant camera pouch outlasted a good hour of driving rain, and my camera was find, even without the storm pouch wrapping the pack. While I won't be leaving it out in the rain again, It's nice to know the bag will protect my gear.