The bag is perfectly designed for one-handed operation. Carabiners close securely and the materials are of high quality. The bag is ideal to provide them with to take to the water.
The opening is no zipper and the camera is easy to stow or remove with one hand. The camera can not slide by itself out of pocket anyway.
Etc. An additional battery pack can not store it. The D10 has indeed no lens cover and the display would be scratched.
Despite the relatively high price I would buy the bag again, but it protects the expensive yet ;-) camera.