In my anticipation for a Saint-Clair in the near future, I made a paper model based on the measurements found on the JD website. I've tried the Saint-Clair messenger when I was in the boutique last Dec 2022, but silly me did not take a picture and of course I wasn't able to check if it fits my stuff, either, so I wanted to check if it does.
Powerbank, lactase pills, extra pillbox for vitamins, spare plastic bags, lip balm, AirPods. Plenty of room to fit more things. It's not even half full yet. Maybe I need to learn to put my phone and wallet in my bag.
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I used the strap of my Prada messenger
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It will be a great bag to have when I visit Japan because on top of these things, I'm also going to carry a pocket wifi, which is a bit bulky.