Yeah, I got a Satori last year with the intention of using it whilst out trekking. Really fantastic quality bag, but I only got to take it out on a couple of brief walks and now that we're expecting a child it's unlkely to get used again for quite a while! It packs a load of gear, has a lot of straps on the outside for attaching a variety of stuff and can also fit in a Camel Back hydration bladder.
Great bags for extreme weather shooting. Having access to the main compartment via the inside helps keep our gear safe and also keeps that part of the bag clean.