In the beginning, back before the invention of the growler, personal supplies of beer were carried in rustic salty bags made of sperm whale intestines. This went on for generations (it was disgusting!) until the evolution of the growler.
Everything changed back in 1997 at a college party in Humboldt county that had just been shut down by cops. A brave and drunk 19-year-old who went by the name of "Space Monkey" saw a problem and a solution which gave birth to the growler as we know it today.
As the cops blabbered on about, "You don't have to go home, but you can't stay here-Yada-Yada-Yada…", Space Monkey realized that there was plenty of beer to drink, but it was trapped in the kegs which were trapped at this condemned party. Than it hit him: Duh, just get it to go! He sprang into action, grab a couple empty milk jugs from the recycling bin and filled them with beer and dashed off into the neighboring woods giggling and peeing wildly on trees.
The party never ended that night, due to Space Monkey's invention of the growler.
As time went on and he somehow "earned" a college degree in Liberal Arts. He got a "cool" job (jobs are NOT cool!), got married, got a dog and stopped using milk jugs to carry his beer around. But his contribution to the world of beer drinking had an everlasting effect.
Today every gas station and yuppy grocer offers growler filling stations.
They come in glass (for your glass breakers).
They come in ceramic (for you ceramic breakers).
They also come in stainless steel (for you metal breakers).
In the future growlers will fade away like any other trend and we'll finally just get those beer baths we ordered, but for now let's raise a milk jug full of beer to Space Monkey.