* Prices may differ from that shown
There are stacks of different options available nowadays for carrying your laptop around in and this one from Belkin fits into the budget end of the market at £20-£25.
It is very nicely designed and has a couple of pockets on the front, big enough to store an MP3 player, compact camera or mobile phone. The straps on the back are adjustable and nicely padded. Having worn one all day (well about 6 hours) loaded up with lunch, a laptop, iPod and a notebook, it was very comfortable indeed.
The zippers into the main compartment are nice and smooth in their action. They also open the bag wide open so you get good access to the contents. Inside there is further organisation pockets for a few pens, maybe some A4 documents, credit cards (if you trust them in a backpack). There is easily room for a power supply (for which they supply a separate zip up pouch). The main compartment for the laptop is not removable. It is however soft lined and well padded. The only area that remains slightly vulnerable is the base of the bag, so I would not put it down too hard. The laptop I used with this was a 15-inch MacBook Pro, which fitted in just nicely. If you have something a little fatter than this, there should still be room.
Overall, this is a good choice if you are on a budget. If you want more features or more padding then you would have to spend a little more.