I got to try one on and play around with it. The strap was a dealbreaker. It was super comfortable but it took me maybe 20 minutes to even get the strap at a setting and then it didn't lay flat at the bottom and bulged in the back. The strap was too complicated and not worth the effort. And I was concerned that there is absolutely no place to add a different strap or make it handheld or have any options. I'm bummed I had to leave it, because it did fit a lot and was lightweight and the design is very clever, but I decided to pass. Maybe I'll regret it but I couldn't be unsure. I was in the Las Vegas store on vacation and was offered it because someone else that day had already passed on it. No one here ever answered my question so in case others wonder the magnet close is good - it will definitely open if you shake the bag (every time I shook it all my stuff came out) but otherwise it seems to stay put.
It’s definitely not a handheld bag. As to adjusting the strap, it takes some getting used to when you adjust it. First to get the length you want and then dealing with making it flat on the bottom of the bag. Wife has never had her flap open inadvertently, but she doesn’t shake her bag.