When traveling, one issue I have is storing small items. A jacket is usually one of those things I might store. However, I could also think of using the jacket as a way of storing things. I have a small softshell which I use this way.
It seems like instead of getting a small briefcase for use while traveling, I could just get a light jacket that is appropriate to use during the warmer climates. A blazer could be stylish, go into the evening, and be put into use like a woman's pareho, or to cover up valuables like a camera.
If warm, could put it on the ground to sit on while on a picnic too. Then again, if it is warm enough for a picnic, maybe I'm not wearing a blazer, but a small backpack. Or I could go light linen blazer. I guess I have a concentration on keeping things light when traveling during the summer, but during the fall and winter, more of a focus on a jacket and being prepared for weather.
Beach day? Bring a cheap, cross-body bag, that's fine. Spend your time, money, and effort on getting good at volleyball, working out, or organizing a beach trip with friends...something that will actually improve your experience on the beach vacation.
Just a thought.