I needed a new bag for my laptop and also a rucksack as both my bags are starting to fall apart and the laptop bag doesn't have the space for all the stuff I want to carry.
If you're looking for a bag to carry a laptop, there's only really one choice - the Swissgear Wenger range. They get consistently high reviews on Amazon and technology blogs for reliability, comfort and storage space. But they're usually very expensive.
I found Comet-Accessories to be the cheapest seller (I was hoping to pick it up from a Comet store but had to pay delivery).
Use code COUPONT10 to get this price.