In reply to LouiseMcMahon:
It held up to some very wet mountain biking, you can put a rucksack cover on it, the anja at 40litres might suit, I guess it depends on the nature of your approach to photography, if you are quite considered and are heading to a fixed point to take pictures and aren't to bothered about taking opportunities along the way then protecting your camera can take priority
personly I prefer to have access to my camera and gear relatively quickly
i would also seriously look at the fast and light approach as something to help facilitate your photography, if you take "all" the mountain gear and "all" the photography gear you will compromise both activities, I usually manage to get pretty much a full ML kit with the camera into a 30L f stop bag even in wintertime
if I wanted to go even lighter for ice climbing I would use an Arcteryx fl30l bag with the Olympus omd 5 in a lightweight pouch on my harness and a gorilla pod I could use on an ice axe inside the bag.
as I say I'm giving it some more thought with an upcoming trip to Scotland so watch this space.