I'm reviewing the above bag for one of the magazines I contribute to, and I thought I would share some initial impressions. Firstly, it's one of the best sling bags I've seen and it has become a firm favorite of mine which will likely replace my Lens Taxi as my most used pack. However, there are couple of shortcomings.
The first is the overly petite haul loop; it's so thin and weedy* I can't trust it when the bag is full of heavy gear. It would be almost better if it didn't have one (it may be an idea to cut it off - it would also make it impossible for some to grab it from behind). Second, the rear pouch is supposed to take a iPad. It does, but if you have a case for it (I have a very slim Hard Candy case for protection) it won't fit. The TurnStyle 20 easily holds my current review kit: Sony Zeiss 1,4/50 T*, SLT-A99, X-Pro1 and Zeiss Touit 2,8/12 T* and XF-55-200mm f/3.5-4.8R LM OIS., but there's not much room for anything else.
You can buy the TurnStyle 20 direct, here. (Actually this link takes to the range of TurnStyle models).
* This is most unlike Think Tank, their gear is usually close to indestructible