After a bunch of trial and error, I think I've finally settled on a good setup that allows me to hike, bike and take pictures while keeping my camera safe yet ready at a moment's notice. I can carry tons of gear, but it doesn't weigh me down excessively. Changing lenses is fast and easy, no need to dig in any bag. And I can easily switch configuration depending on the conditions. Only problem is, I look like a complete dork. But I don't care, I just take pictures of the people who look at me with expressions of bewilderment.
First, let me apologize for the quality of these pictures. It's freezing cold and snowing outside, so I had to take these indoors. And since my K-7 is part of the gear, I had to take these shots with my Canon S3 IS, which is a terrible indoor camera.
First, the super hero pose:
followed by the improbable walking pose:
Notice how the camera is secured to my waist. I can slip the neoprene cover off and be taking pictures within seconds. This has been the greatest improvement, since it allows me to ride my mountain bike without having to take the camera in and out of the backpack. It's held in pace very securely, and my soft belly does a great job of absorbing impacts. And since the camera is attached to my backpack straps, there's no weight pulling down my neck.
Also notice I've added a couple of lens cases to the straps. So now I don't have to dig through the backpack to get to my lenses, just swap them out right from their cases. I have the DA* 50-135mm at my right hip, and my "other lens" case at my right shoulder (I picked that one because most of my other lenses can fit in there, one at a time). I can still carry 3-4 more lenses in my backpack if I want to torture myself with more weight.
If I'm cycling through tough trails where I might fall off the bike, I'll probably leave the camera in the backpack. The Lowepro Primus AW pack has a lot of padding and keeps all my gear real safe. But for trails that are just converted railroad paths, or for hiking on foot, this setup is perfect. There's even a water bottle case available that I can put in other places on the bag.
In the future, I'll probably replace the lower strap of the backpack with the neoprene cover, just so I don't have 2 straps down there. Other than that, this setup worked perfectly last friday and made shooting a whole lot easier. I'm not kidding, though. People were giving me some weird looks.
At least I don't look like this guy: