I really don't understand the people complaining about the size of this bag. In the field of 17-inch laptop bags, it's one of the smallest. It's slim-line and, due to its lack of external pockets, doesn't stick out at the sides or the front. It actually takes up less space than my previous, 15-inch, bag. It's a fabulous bag, beautifully made, very high-quality and also very lightweight. The lining inside has a lovely, luxurious texture, the laptop section is well padded, the back section is rigid enough to be supportive without being entirely inflexible, the zips are sturdy and everything feels generously made and solid. The colour and design is stylish and under-stated, and it manages to look elegant, sophisticated and, above all, grown-up despite being ultimately a rucksack. The smaller case that comes with it (actually intended as a cable case I think, given the picture of a power cord on it) was a fabulous bonus. I have been looking for a solidly-constructed pencil case of about this size (without some silly kids' cartoon on it) for literally months with no success. It was exactly what I've been looking for.
I would say that I'm actually using this bag to carry a 14-inch laptop. I know, from previous experience with Belkin slimline bags, that you have to go at least one (if not two) sizes up, if you want to put anything in there other than the bit of electronics it was designed for. Into this bag I can fit my folder, some other papers, laptop, laptop rest, charger, bulging pencil case, wallet, keys, phone (there's a very handy zipped pocket inside but at the top of the bag which is just perfect for a phone) and even a bottle of water without disrupting its beautiful lines. And all for about the quarter of the price of many other bags out there. I really cannot recommend this enough.