The Retrospective 10 is in my opinion ideal in size for the amateur photographer with an APS-C DSLR camera (I had a D7100). The camera and lens and two lenses, and a flash and accessories fit in well.
In full format, it is just due to the still often quite large lenses with the space, for users of system cameras, the bag is maybe too big.
The layout is flexible and you can also back a separate compartment still take his loose iPad.
A rain cover and great details round off the positive picture. For example, you can fold up the Velcro to noiselessly open at weddings or other events where you can not really stand the better pocket can.
The outer material is a kind of canvas, which unfortunately attracts some dust. With a damp cloth, the bag is clean but again quickly.
For me, the Think Tank bags are the perfect solution and I recommend you.