Made to compete with Billingham perhaps?
The only thing that has always bothered me about Think Tank's messenger style bags, like these, is the lack of a good tight fit to the flap unless a zipper is used. And zippers tend to be the pretty fragile. Look at the video and notice the way the flap leaves wide gaping areas on both ends of the bag. This allows rain, dust, etc., to get inside and on the equipment unless you zip it up tight which restricts easy access. Billingham sews in a gusset type feature and there are no gaps in these areas. Access is unrestricted as well.
I'm really a fan of Think Tank's bags. I use all three sizes of their sadly discontinued City Walker bags because I like the internal design and light weight. I just wish they would take the cue from other maker's designs and fit the flaps a little better to the bag's body.