It has a gray outside, with green doors. It has the words, "Puff's Boating School" in dark-pink letters, with a lighter pink cloud around it.
Role in episode
Mrs. Puff's bus serves as the transportation of Mr. Krabs' band (consisting of SpongeBob and Squidward as the musicians and Patrick as the roadie). Mrs. Puff is seen fixing her bus up until Mr. Krabs steals it from her when she isn't looking. With the bus, Mr. Krabs drives to many different venues until he is able to buy back the Krusty Krab at the end of the episode.