I bought this bag for my twin lens Sony NEX-5D. It fits perfectly well, I have in the bag my camera with the 18-55 lens mounted on it with the shoulder strap and the lens hood, the 16mm pancake lens, a spare battery and the flash.
I was worried this will be too small for my camera and I was about to buy the bigger model which is the Apex 110AW, I am so glad I didn't otherwise I would've lost the key feature of my camera which is the small size.
This bag is just perfect, not only it's small but also very high quality, it's obvious that attention has been paid to every small detail. It's really nice to carry and the price is very good.
I'd say if you have a SONY NEX-5 with the kit zoom lens or the twin lens, this bag is for you.