This is a great bag, into which my 15.6" laptop fits with ease. There are pockets and compartments galore on this thing.
The main zipped compartment has a padded pocket for your laptop, with a slender one on the front for your tablet, leaving the rest of the space free for whatever else you might want to put in there - as long as it's quite slender.
The compartment in front of that is roomier, with three slip pockets, and a zippered mesh one... not sure why. The rest of the compartment is left open for whatever you want.
Across the rest of the bag you have two side pockets - good for chargers, but just a little too small for a 500ml bottle. There's another pocket on the bottom, and the front has a little flat zipped one, as well as an open space behind the clip, for anything you don't mind losing. Finally there's a little pocket by the top handle, perfect for a phone, or anything small and flat you want to access in a hurry.
The bag itself is solid, well made and reassuringly heavy with padded straps and sturdy handles, and all the clips you could possibly need for keeping it all together.
It's a good, useful product of high quality - but at this price it really should be! Case Logic are a good brand, and they know what they're doing with this sort of stuff, but I'm not sure even this bag is good enough to justify that price tag.