I just bought ( Saturday morning from my pro) the Titleist "ultra lightweight stand bag" :
http://www.titleist.com/accessories/carry_...lightweight.aspIt is clearly manufactured for Titleist by SunMountain and , apart from the strap system, it is very easy to see the resemblance to the SunMountain Swift bag: same overall weight [ 3.3 lbs]; same ball/bottle pocket , same two way divider that has you concerned, etc.
I have carried it for two 18 hole rounds this weekend and it seems fine. I think I would prefer the strap system on the Swift but the "back pack" harness on the Titleist bag does not bug me like I thought it might.
So, after only two rounds, it seems to be working fine. That said, this bag just "bumped" my Ping Moon-lite bag which is a
brilliant little bag that weights only 2 lbs and holds just as many clubs.