7+ miles, 2k+ feet in the first 5 miles... super out of shape me (about a mile an hour for the trip). 20 lbs more than I should've in the pack (stress test, and make sure the wife was warm, well fed, comfy, and not packing too much).
my feet, legs and lungs hurt.
my back is fine.
my arms got a little funky (extending too far too fast got the weird nerve pinch electrical feeling).
all in all best dang pack I've ever owned!
only complaint, rather than building upwards it builds out and you get that easily off balance feeling with a full load in the center removable pack, also tends to grab on trees beside you and make it difficult to get on when completely loaded up. I've had worse though, or rather I haven't had better, if it's more than a single night fishing trip I'll deal with the extra weight and take this.