I love this pack.  It holds everything I need. It has two bottle sleeves  that I can reach fairly well while moving.  It has thick straps and solid clips. My version has a rain cover stuffed in a pocket on the bottom of the pack.  I've worn it for six months and had no issues with the pack, the clips, the zippers, or the webbing.  five stars there.  My bladder developed an intermittent leak a few weeks into use.  It went away almost before I understood the problem.  It came back, and went away again.  Finally I figured out it was the o ring on the quarter turn twist cap.  I sent an email off to Camelbak and heard from the customer relations guys but not from the warrantee side of it.  I have an old spare so its no big deal for me. The quarter turn cap is nice, but...if it is not 100 percent reliable what use is it in racing situations?

I recently ran a 100 miler. At 6 hours I had to trade out the bladder and it cost me time. About 14 hours in I began to have muscle spasms above the kidneys.  I pulled the pack up, tightened the waist belt, and the spasms went away.  It was uncomfortable to run with it in that position, but the muscle spasms only returned when I dropped the pack back to its hip level standard. I don't know if I can use this Alpine for ultra style running over 14 hours.  May have to use my Mule, which is a drag, because the Alpine has great wide belts and comfortable arm straps.

The pack gets a 4 because of the bladder issues. I don't know if not being able to wear it comfortably for over 14 hours straight is much of an issue to many people other than ultra runners.

===I recently refolded and adjusted the rain cover in its pocket at the bottom of the pack and this seems to have eliminated the lower back pain, so I believe that was the problem and not one inherent with the pack.

===I upped my rating to 5 star because Camelbak got back to me with a replacement cap and gasket within 10 days of my contacting them.  No questions asked and both warrantee and customer service people were all over it.  Their concern was quite sincere.  Thanks Camelbak!