From the Super Mario Wiki
Retrieved from "http://www.mariowiki.com/index.php?title=Goldfish_Bowl&oldid=2047968"
The Goldfish Bowl is an item in the game Super Paper Mario. Pook gives the Goldfish Bowl to Mario, Peach and Bowser in Flipside because they managed to find a better spot for Captain Gills the goldfish to stay in. After Mario and co. free the goldfish, the bowl can be used as a Helmet so Mario and co. can breathe in space.