hopefully i am wrong, but my initial instinct is that holster will sway up and down. hopefully not.Something like this I hope will work with everything.
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As a follow up FWIW, I spent 3 days in the high Unitas with this and it worked very nicely. Holster did swing a little but it would have been uncomfortable if it didn't. It didn't swing free but did move with me if that makes sense. Bottom of the holster was about even with my pack belt. I would prefer the holster higher but the only way to do that would be to go behind the binos.It doesn't seem to, lays flat on my stomach. We'll give it a try and see. Straps could be added but it will be nicer if it works without. On that Marsupial Gear pack the molle loops wrap up the back a bit and it dampens the holster if that makes sense. It doesn't hang/swing free.