Rob Brummett wrote a review of Gregory Z 55 Backpack - 3112-3722cu in on November 19, 2012
Familiarity: I've used it several times
Solid pack for hiking with multiple people. Might be a little small if you're looking to hike solo. A bit hard to get a water bottle into the side pouch on the trail. Loads easily with three nalgene bottles across the back. The top cover/pouch is a little annoying the way it is attached by straps to the bottom portion of the pack and falls backward when opening. Just took it on a 2 day 23 mile loop in the Ouachita National Forest and it performed very well. I would recommend it without hesitation.