@HasAReason2Believe It has the "Sling" feature too, where you sling the bag in front of you and you have easy access to the camera from an opening on the side.
@DaveTreadwell I was thinking about getting the Fastpack 250 at first too, but when I went to the shop and looked at the bags I opted for this one instead because it looked a bit more sturdy and has a one strap option. It was a bit more expensive though but I got it like 10% off 'cos I know one of the guys who work there.
I'm planning on buying a 24-105mm f4 lens when I'm on my US trip btw.