They're huge containers with bendy straws. You may purchase them at the park, and refills (without a season's pass) are $1.08 (with tax). You may use the mugs on future trips and all the Busch parks (Water Country, Busch Gardens VA/FL, Sea World, Sesame Place, etc). I still have cups with the Big Bad Wolf and DrakenFire
I don't know if they sell them still because I'm using mine from years past still, but they used to sell straps that were kind of like lanyards to put on the cups. I really recommend them to free up your hands. I usually toss mine on my shoulder like a bag.
One word of warning DO NOT put them in the dishwasher. Over the years I have melted more than one cup in there.
Unfortunately, the cups are pretty ugly this year. They're neon yellow with the graphics from the current coasters.