Confusing? Take a look:
The Camelbak Quick Grip allows you to slide your hand in between it and the water bottle. You tighten the strap and you can let the water bottle hang. I love not having to hold onto the bottle, therefor my hand doesn't cramp up. It even has this nifty little pocket for stashing my keys and ID.
For short trips I wish the bottle was a bit smaller but overall I love having it to use when I don't want a backpack but want to bring water with me.