These are pretty awesome! Apparently they are now available at Hollywood Land inside Disney's California Adventure.
I have yet to ride the new Guardians of The Galaxy ride but let me tell you next time I go to California Adventure not only am I buying a Groot cup but I am riding the ride with one in hand.
Oh ya... I'm already thinking of all the awesome Insta vids I can take with this cup.
Source: Instagram/ Sasakitime