I use a Pentax Optio S. The camera fits inside an Altiods tin. Then the tin goes in a small pouch which hangs from my sternum strap on my Camelbak. That makes the camera easily available, which is most important to me. It takes great pictures unless the lighting is dark. I have found that if I have to take my pack off to dig out a camera to take a picture, the camera does not get used much.