National Geographic describes this Viennese toiler as “an old-timer tamping bunches into a backpack.” Odd-looking backpack. And it’s not a wine bottle, but you knew that. It’s a pige.
And this here is pigeage.
This process is known in French as pigeage and is part of the maceration process that extracts color, flavor and aroma compounds from the grape skins into the wine.–wikimedia
Seems like the same idea as a mortar and pestle, no?