The smallest of bags is the Vision 10, which will fit a standard-size camera body with either a short zoom or wide lens attached, alongside another lens or two. If mirrorless is more your flavour, the 10 should fit a standard size mirrorless camera and three or four lenses. 

The Vision 10 in Dark Olive colour.
The Vision 10 in Dark Olive colour.

The mid-size Vision 13 has enough room for both a 10-inch tablet and a 13-inch laptop, as well as a 70-200mm lens.

The Vision 13 in Dark Olive colour.
The Vision 13 in Dark Olive colour.

Finally the Vision 15 offers the most space, with plenty of room for a standard size body, an attached 24-70mm lens, as many as four lenses and other accessories like a flash, and up to a 15-inch laptop. 

The Vision 15.
The Think Tank Vision 15.

All three bags feature a water-repellent DWR coating and polyurethane underside coating, as well as YKK zippers and antique-plated metal hardware. The trio of bags also feature padded shoulder straps, phone and water bottle pockets.

The Think Tank Vision series is imported into Australia by Blonde Robot, and should be in all good camera stores very soon.