Adjustable shoulder straps and countless tension straps make it easy to get this pack to fit like a glove. Good breathability at contact points along your back. Top opening makes it easy to stuff all your gear. The only reason this didn't get 5 stars is due to the straps that contect the top cover are tied into the mesh pocket portion of the pack and tend to pull pretty hard when you lock down the top. No a big deal and I don't see this affecting the longevity of this pack. All in all, a great pack for long weekends or ultralight multi-days.