Yep that's the only way I can do it too but it feels constricting at times, specially when you need both hands to be free. I'm very comfortable with messenger/sling bags and backpacks but I'm trying to investigate other bags.
I'm so amazed when I see my mom walking effortlessly with her purse on one shoulder and several shopping bags in her hands.
I don't understand how it's possible either. Mine is always slipping off and nearly dislocating my arm. I miss the days when I had to carry a ton of stuff in my backpack.
“Everybody has a secret world inside of them. All of the people of the world, I mean everybody. No matter how dull and boring they are on the outside, inside
them they've all got unimaginable, magnificent, wonderful, stupid, amazing worlds. Not just one world. Hundreds of them. Thousands maybe.” -Neil Gaiman