This camera bag is actually made up of two independent compartments. The bottom section sits on a waist belt and can be rotated around to the front of your body for easy access to equipment while the top section stays in place. Here's a quick video demo of the bag in action which shows it much better than we're able to describe it.
This is actually the second iteration of the bag and it's smaller than the original. It also comes in a blue color way that we think looks pretty excellent.