Hi Olivier,
Just a quick message re: the post above.
Having re-read what I wrote, I just wanted to make a few small changes to make sure what I put is not misleading in any way.
Firstly, the Argon has had plenty of 'in-house' testing by Osprey, it just hasn't had a lot of official testing in the public domain / outdoor press yet, as it is still a very new product for us. The design of the Argon is essentially an evolution of the Cresent series, with the same Re-Curve suspension system coupled with upgraded fabrics and features.
Secondly, the fabrics used on the Argon can be classed as waterproof, not just water resistant. However, as I said, the seams on the Argon are not sealed, so as a product/design, it is not classed as waterproof and will still let water in through the seams.
Finally, the Argon 70 weighs in at 2.5kg, as opposed to the Crescent 70 which weighed in at 3.1kg. I didn't mean to suggest the Argon is a whole 2.5kg lighter than the Crescent.
Sorry if my first post was mis-leading at all. I hope the above helps to clarify what I wrote originally. Thanks.
Martin