In reply to Oscar Dodd:
I carry a small camera. I've tried some of the fancy solutions and don't like them. The shoulder-strap camera clips are a bit floppy with minimal pack straps, put the camera in harm's way if scrambling, and the viewfinder tends to get fogged from proximity to body heat. The best solution I've found is to use an ordinary over-the-shoulder camera strap, adjusted on the long side, and tie some sturdy shock cord around the waist. When walking, scrambling, or climbing, I tuck the camera under the shock cord and push it to the side or behind. The shock cord pinches the camera strap and keeps the camera out of the way until I want it. I use a neoprene camera case that comes completely off to protect the camera from bumps and drizzle. If it is raining hard, the camera goes into my pack.
The shock cord works so well I use it in the city too.