Great pack! (Quantum 55L)
Bought this pack for a week-long ski-mountaineering trip - seemed much more spacious than the 55L quoted volume. SUPER light - even when not stripped down. And seems bomb-proof - didn't flinch at being dragged through alders and spruce forest, then used as a door to keep snow out of a snow cave! All the features you need, except perhaps little wand pockets to stash poles or the odd energy bar in. Otherwise, highly recommended.