I have an eddie bauer duffel/backpack that works well for me but isn't really professional.
I think something like the Thule Aion is what I'd look at if I wanted something that looked better.
I've been using a chrome barrage as my everyday carry bag and it works great for weekend trips, but it's not as convenient since it's a top loader. It's on sale now though!
https://chromeindustries.com/product...40554886594620
I think photography style backpacks work pretty well since they're designed to be opened up all the way to access gear instead of piling things up from the top.