Take a look at this. This is a $200 Mountainsmith backpack. Do you see thickly padded straps on it? No, you see a well thought out harness system that distributes the load across your shoulders, back, hips and chest. Looks pretty similar to the Husky system, doesn't it?
The chest strap does take some of the load in addition to stabilizing it. What do you do if you're standing for an extended period of time...find something to lean against, right. That's essentially the type of weight transfer you get with the chest strap. If you don't believe me, take a 10 pound dumbbell and hold it straight out in front of you for as long as you can. Then do the same thing but with it pressed against a wall.