I don't know if it's just me but I've often wondered why shoulder carried gadget bags (of which I have a few) have lids that have the hinge on the side that's next to your body when it's on your shoulder which means that you have to hold the lid open with the hand on the opposite side of your body to get to the contents with the hand on the same side when it would be far more user friendly to have the lid hinged on the opposite side to the body so when open it would stay open and give much easier access to the contents with just the one hand.
I've used f64 bags for years for exactly that reason. They open on the body side and access is very easy. I like them especially for large format. Getting at film holders, etc.