I am a long distance hikers with two Appalachian Trail thru-hikes under my belt and around 5,000 miles hiked. I've used and been exposed to many types of packs from those weighing ounces to 5 or 6 lbs. But I've never seen a better made pack than the Osprey Exos 58. My first impression was good at REI when I loaded it with all of my gear and put it on was bliss as it fit comfortably and was so light. As I hiked the pack continued to meet and exceed my expectations as I exceeded the pack weight limitations of around 30 lbs by 15 lbs with 45lbs with a weeks worth of food and water. (Not recommended long term) I love the "trampoline" where the pack frame is about 2" off of your back and a mesh sits on your back so that wind passes between you and your pack preventing the awful sweaty pack back! I'm not the only one who loves this pack as on my AT thru-hike this pack is becoming the dominant pack in the AppalachianTrail community. Check it out for yourself and you may soon own one of your own! - Squarepeg 2013 250 mile Appalachian Trail section hiker, 2015 & 2016 Appalachian Trail thru-hiker.