In reply to deugar:
It's an Aquapac something or other that a mate very kindly gave me. Don't know what they cost but I can't really recommend it for scrambling, climbing etc. I'm using it because I've currently got nothing else, but long term it'll be my wet weather walking - only bag. On the plus side it's waterproof. Downside, the roll-top and unstructured insides make getting camera in and out quite a fiddle. It's also bigger and squarer than it needs to be.
A basic Lowepro bag or similar would be better