That expedition 6x looks nice.
I'm using a Lowepro slingshot which is fine (I actually really
like it!) until I buy the Nikon 80-200 2.8 and then it won't fit.
Since I tore up my knee two years ago, my hiking is limited and really can't lug around a full pack.
For what I'm carrying now, the slingshot works fine and is quite convenient.
In the slingshot, I carry the camera body (D80), two lenses (70-300 and 18-105 (but one or the other is on the body)) along with extension tubes, flash, filters, and misc. accessories. It doesn't have a real tripod holder, so I have to carry that separately which is a pain. It certainly won't hold a laptop.
It's great for a day hike with limited equipment, but I'll need to step up a size when I am ready to trek further, or (most importantly!!!) add more glass
I came; I saw; I shot; I shared.