In reply to Bob_the_Builder:
A nice review - I was thinking about buying the same sack, but went for something different instead. I already have 7 or so rucksacks in range between 30l and 45l, so I won't buy another one soon.
Honestly, if I go for a rucksack over 30 litres, I must have a bottom access to the rucksack. It's not that necessary if most of the stuff inside is actual climbing gear, but I had Lowe Alpine Hyperlite Quark 40 (or something similar - it's really old rucksack) and I hated getting everything out and in every night and morning while bivying.
I like how Lowe Alpine addressed bottom access for winter conditions in Lowe Alpine Mountain Attack 45:55 (they are still only 55 pounds on RockRun.com) - it's on the side of the rucksack, so you the back system of the rucksack does not get wet. Also, it's a shorter zip, so it's lighter as well.
I found Osprey to be over engineered and they sometimes lack overall consistency. Like Exos 48 side straps look so funny! If the rucksack was under 20l, that would be okay, but they look like they are prone to break any time! Still, I am not even sure if they would break. They just look like.