In reply to Martin1978: Yeah, I can't understand 35 litre bags that are over a kilo, and can't understand why so many people seem to buy them.
You can get a completely bombproof bag of 1000D nylon with all the gubbinz and comfort you need at well under a kilo. Even Arc'teryx's new 'super bag' (recently featured on UKC) is not vastly more expensive than this pack, is way more innovative and has roughly similar fabrics, and is also a third of the weight.