Really any of the Titleist lightweight or ultra lightweight stand bags are solid choices. Just don't load them full of stuff if you want to make it through all 18.

I bought the ultra lightweight stand bag last year b/c i wanted to start carrying and walking more.. I love it! Plenty of pockets to only put in what i need and go from there. It's very light to carry and don't mind it at all. I played yesterday and felt great after walking 18.

Only downside at the moment:
1) 3 way divider so it can be tricky at time getting the club out.
2) I bought a new one without the Team Titleist logo but thankfully I have a sweet bag tag to represent. :)

Hey Brian, I am a walker and I carry as well. I have the Ultra Lite Titleist bag and its awesome!! I also for years now am a minimalist when it comes to what is in my bag. I only carry what's absolutely needed. That includes clubs. I carry for 9 or 18 with no problem.
Good Luck

has anyone used the premium carry bag? Pros and cons?

Thanks for the feedback, everyone. I bought a 2014 model and have used it for my first few rounds out. So far it is just as advertised.