I will say that a number of caddies down there are very quick to swap to a changeout, but also more generally people are completely insensitive about the weight of their bags and then the contents they put in make it worse.
With that, I think the best solution depends on how much you stuff in your bag. If you tend to carry a dozen+ balls and countless other items (rangefinder, sunscreen, umbrella, rain hood, 200 ball markers, etc), go with a two bag solution and I'd strongly recommend the 2.5+ people are recommending for the caddie bag. Titleist Carbon 4 tends to be a good option too. Even for your second bag, I would probably still recommend something with a stand, a Vessel could work well. If you run light, I think you can open up towards some more premium looking bags but I would still aim to keep it under 4.5lbs. I think this generally eliminates all (most?) Vessels.
I walk/carry/ride about 40/40/20% of the time and am a relatively light packer (two sleeves, rangefinder, tees/markers, small sunscreen, water bottle). I've had caddies give positive marks to my Hudson Sutler bag for its weight.