I have never had anything fall out. I keep phone and cles in the front pocket and often forget to zip (bus pass in cles gets a lot of use)
The top zip is fine to leave open as well as it sits so closely to your body.
Good luck- and I plan to add more from the men's line. Soon I hope [emoji4]
Thanks to everyone for all for the info! I will definitely check this bag out. It looks like on the France site they only have the PM.