The big advantage to me with the HPG kit bags is that you can hook them to you shoulder straps t bear the weight of the kit bag. Otherwise I wouldn't want a pistol and binos, plus whatever else is in there weighing on the shoulder straps for a long time as most straps tend to be very thin.
That is a great carry option with their bags, for sure.
I also have a few buddies that combine a HPG Kit bag with the RYO bino harness. They love the system, but again, much bulkier than I personally prefer. The KUIU Pro bino harness I've been running is fairly basic, but sometimes gets in the way. Again, just personal preferences and styles.
