I use this for work and for personal travel. It's perfect for everyday to and from the office, but where it really excels is for overnight work trips. I travel as light as possible so I usually pack clothes in a duffel backpack, which is why the messenger carry on this bag is perfect for the airport with something else already on my back. It's smaller than most backpacks so I can fit it between my feet vertically giving me more leg room on the plane. Once I get to my destination, i convert it to the back pack and I'm off and running. I am not the smallest person, but I have not run into the issue of having the pack straps being too small.
For personal travel this fits a computer and my mirror-less camera set-up, again allowing for the same versatility called out above. Overall this is one of the best bags I own, and has become my new go-to.