This larger fanny pack holster enables you to carry your gun and magazine in separate compartments and carry a couple extra magazines and a light. It is quite a bit larger than the medium version, but, if you can pull it off, it works well. The compartment enables you to quickly draw your weapon. The holster opens by pulling on a tab in the corner with the support side hand while drawing the pistol with the shooting hand. See our training video to see more. We really like this particular holster as well as the medium version. If size is an issue for you, go with the medium.