Green glass bottle from Mississippi River

I was walking the Mississippi river today and found this green bottle. I know very little about glass. I googled and had no luck. This could be something new and nowhere near an antique but couldn't pass it up.
The lid had "ZA-VENT" marked on it and underneath that it says "PAT. NO. 4,007,951".
At the curve near the neck of the bottle is a floral design that somewhat looks like an olive branch.
On the bottom there is the number 21 stamped and eight "8's" stamped around the 21.
Any ideas?
https://imgur.com/a/KpF1jrt

 

https://www.vipackaging.com.au/product/cap-zavent-press-28mm-gold/

 

The riffles around the perimeter of the bottom are there to help move down the conveyor from the automatic bottle blowing machine. Its relatively new.

 

Hi,
The aluminum screw cap is also a give away to it's newness.
greg

 

Thank you, everyone!