Is there a limitation to what counts as a "diplomatic pouch"? According to the Wikipedia article, even shipping containers have been used before [0]. [0] https

Is there a limitation to what counts as a "diplomatic pouch"? According to the Wikipedia article, even shipping containers have been used before [0]. [0] https://en.wikipedia.org/wiki/Diplomatic_bag#Noteworthy_shipments https://en.wikipedia.org/wiki/Diplomatic_bag#Noteworthy_ship...