well.. i fear those babes are poseurs, not bicyklists.
actually, this summer I bought a nylonish "handbag" at a flea marked and stitched on short straps w buckles
https://www.radicaldesign.nl/en/prod...terial/buckles . worked great for a long time. Bag is looking a bit "chewed" at this point. Used it a lot and is now looking for another bag to modify. As long as the bag is smallish it works. Can be clicked onto any bike in no time, no adaptors or stuff needed.
I like the clickfix system (and all types of gadgets) but did not buy much yet. Need to find systems that work with several bikes without costing the equivalent of several bikes..