I happened to be poking at Cassian's flask images today, screen capping the scene to see if I could make out just what they did with it.
I did a quick-and-dirty Photoshop mockup, so in case it's helpful to anyone, I'll share the layout here, along with my screencaps. Hope this thread is an ok place to plop this. I wasn't sure it really warranted a separate post.
The design and shapes are super simple, it turns out, so it shouldn't be hard to work something into a mask if anyone wants to paint their Stanley flasks up to match. (which is my plan... I'll work these up on my Cricut and use them to mask while I paint). There's one side that is never seen, but given the design, it seems pretty logical that is follows the same pattern all the way around, so I'm not worrying about that.
Three colors will be needed, some sort of moderately dark green/olive for the the majority of the body (a little darker, I think, than my PS version below), looks like perhaps a satin black for the top parts (it's shinier than the rest), and a gray, I think, for the circles. I initially thought those circles just let the body color through, but looking closer it seems clear they're lighter than the rest of the body.
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View attachment 1823677
(I searched high and low for a good side pic of the flask, and only found the one, so the "other" side view is repeated there... just a warning for someone to keep that in mind and don't take that photo TOO literally. Also I suppose it's not actually Cassian's flask, it's Luthen's, just to be pendatic at myself LOL)