Love at first sight was my reaction to this pack. But yesterday I really put the adventurist/pack relationship to the test. Beginning at 4am, my buddy and I traversed over 40 miles across the Pictured Rocks National Lakeshore in under 15 hours. With some careful packing, the Mule fit my food, OR Ion Pullover windshirt, and extra t-shirt, as well as camera etc without stressing the zipper seams, and I filled and drank the 100 oz hydration reservoir 3 times. For over 30 miles I hiked w/o a shirt, and the straps still felt good. I appreciate a pack that doesnt rub your shoulders raw from friction. I ran some of the long downhills and by cinching the Mule's straps down, it didnt bob or swing an inch. Didn't even cause any noticeable sweating against my back. It's easy to swing around to your front so as to riffle through the pockets without slowing down or stopping. Now I just gotta find a way to shrink all my college textbooks and laptop so I can use it for class!