Water resistant 1000D shell and 300D ripstop lining, fully padded main & laptop compartments, 1 x external gusseted zip pocket w/6 pocket organizer, 3x internal front pockets, adjustable main strap w/Quick Flick buckle, adjustable removable shoulder pad with Third Leg stability strap, clip and velcro release flap, fits 15" laptops, 4 colors available.
Weaknesses: * Difficult to secure laptop sleeve when bag is loaded
* Lack of outside pockets
* Maybe a bit too much velcro
Overall, this is a very good messenger style laptop bag.
The laptop sleeve will hold a computer about 14" wide and about 12" deep. Their specs says it will hold up to a 15" wide computer, but that would be a squeeze. The flap that goes over the computer secures it well, but is difficult to attach when the bag is fully loaded.
The main compartment of the bag, directly in front of where the laptop goes will hold several inches of books, magazines and papers.
There is also a zipped pockets with plenty of sleeves for pens, small electronics, loose notes and so on. You can also stick a bit of stuff in here as well.
The front flap of the bag has a zippered mesh compartment. I use it for holding my lunch, but it would also be a good place to sticky sweaty cycling clothes.
I've ridden with the bag a couple of times and it serves very well as an over the shoulder messenger bag, especially when you use the third leg stability strap.
You can see my full review at: http://www.bikeworldnews.com/index.php/2008/10/23/review-crumpler-part-and-parcel-laptop-bag/