It was demonstrated in the movie 'Star Trek IV: The Voyage Home' that the transporter system aboard a Klingon Bird-of-Prey could be used to transport two adult humpback whales (George and Gracie) plus a massive 18,000 cubic feet of sea water into a transparent aluminum tank, built into the ship's hold to receive them.
Combining both the whales and water results in a massive transport, which leads to the question: Has a larger single transport ever been done? How much can actually be transported in a single pass?