Have had my PAC bag for a few days now. Very cool bag, and pretty sure my bag search is over now. Perfect size. Has all kinds of neat pockets and places to put stuff. Nice keyring and small zippered pocket on the outside for a phone and wallet. Inside mesh pockets along the wall, divider on the back wall with more pockets. Various straps and loops.

The strap is sick. 3/4" of padding across shoulder and chest. And also padding that wraps around the rib cage. The back panel has removable padding. Haven't used the xstrap yet in a real situation. But did a simulation and it does take some of the weight off your left shoulder, doesn't seem to split it equally, although haven't really spent much time adjusting it, probably only something I would use on rare occasions.

Stuff does feel lighter when its in the backpack though, not because of 2 shoulders. Just the way the weight pulls against you. Straight down vs on an angle. At least that is how it feels. But the thing about the backpack, at least with a long one is you have weight on your lower back, compared to a shoulder bag the weight is against your upper back.

This bag gets a 10/10 for coolness, and construction. Just a sweet bag. I will rate back on comfortableness and overall how good it is as a bag in a couple months. Need to break it in.