Here's what we've experienced
The fit on this bag is a little large, but I was larger when I bought it. It actually cinches down really well. All the straps are very comfortable and adjust at all the right spots. They also have a ton of venting on the straps and the back
allowing air to flow just about everywhere. I would say that the bag is very accurate in its advertised calculated volume. All my gear for my hikes and mountain bike trips fits well. At first when I bought this bag it had a couple bad
slider buttons and it caused me to lose some very expensive trekking poles. Osprey quickly rectified the situation and from what I understand the newer bags have better security.
Because of the numerous pockets and one large pocket all of my gear is fairly easy to access. Packing the bag is a breeze. The load is always very well distributed and I am always very comfortable with the bag on me, no matter what is in it. It condenses and expand well to form to whatever load I have. Some parts of the bag are designated for certain things and it all works out really well and to my comfort.
Originally I bought this bag because of the great lifetime warranty, but I don't think I'll ever have to worry about using it again. The bag has surpassed my expectations. The $160 I spent on it at the time was a great investment and still is. I have had the bag for three years now. It has seen the back woods of Maine, mountain bike trails in Ohio, lakes and rivers of Pennsylvania, and will be seeing Iceland next year. It's still in fantastic shape and I expect it to stay that way for many more years to come.
M/L - 1 lb. 13 oz.
S/M -1 lb. 12 oz.
Feels incredibly compact
None, so far