I recently used this on a backpacking trip on the Superior hiking trail . It was the 1st time useing this backpack. I was caring about 30 pounds for 4 days on the trail. The epic 45 was amazing I own few different backpacks Out all of them this is by far the best . We hike for about 10 hrs a day i never had any sore spots I dint ever have to adjust the straps with the ergoactiv system it was great on scrambles with the amount of movement that you have and no pain at the end of the day I highly recommend this to anyone ...