In 2004 the Cassini spacecraft arrived at Saturn. For the next 13 years the mission collected the largest ever, amount of data on Saturn’s magnetic and space environment (magnetosphere). Due to Cassini, Saturn is now the second most observed magnetosphere after that of Earth and many of our previous expectations about the Saturn environment have been overturned from this data deluge. These unique datasets allow for the first large-scale statistical analyses of how mass moves around Saturn. It is now understood that a Rayleigh-Taylor (RT) like instabilities, called interchange, are instrumental in these processes by exchanging different plasma populations around Saturn. Saturn, and other giant magnetospheres, provide some of the best observations of these instabilities in a naturally evolving system allowing important studies that help fill in our understanding of transport around planetary bodies.