[marknorton]

Another vote for Lowepro - good value and a versatile range. If you are trekking, I'd certainly go for a backpack solution; much less tiring and keeps it out of harms way if you need to use your hands to climb.

I think there's a version of the Omni range which works as a backpack and which opens like an attache case, ideal for Leica M equipment where you don't need a lot of depth.