Hey Ben...I'm not trying to convince you to buy a design you're not into, but thought I'd just add to the commentary.
I too like my backpack style bag mainly because I'm finding that I'm carrying a ton of other stuff along with me in my travels. For example, I have a laptop, one carry-on suitcase, and my backpack camera bag. The backpack bag gets all my camera gear up on my back and out of the way so I can carry my laptop over my shoulder and wheel my carry-on suitcase behind me. I can go through the airport like this without dropping anything or getting too fatigued.
The other thing I like about my backpack bag is that it's big enough that I can either load it up with photo gear, or leave a little bit of photo gear out and put my taping gear in (along with the camera/lens and a spare lens). If I'm heading to a gig, sometimes all I need is the backpack bag for both my photo and audio stuff.