Its a neat concept - might feel a little flimsy to some but I don't have worries about it tearing and while I haven't carried it through a pouring rain yet, I wouldn't hesitate to use it at the gym pool, beach, outdoor events on the lawn, or elsewhere. That said, it is small (3L if I recall). I've used it for a set of keys, my wallet, and my phone...if I had tried, I might have fit my sunglass case in there as well and that is a perfect use for me. But, I don't think anyone is using it for their bathing suit post swim or sweaty gym clothes separated in their gym bag...it's just too small to hold much more than what would fit in your pocket. It would be awesome if Matador made a 10 L large version to go along with the droplet. I'd buy it in a second as the two would complement each other very nicely.
This review was written in the old system and had content requirements that are different than reviews written today.