Ryan Braun typically uses a "Sam Bat," a 35" maple bat made in Canada. He has been using a Sam Bat virtually exclusively over his career.
An article describing his bats is at: http://milwaukee.brewers.mlb.com/news/article.jsp?ymd=20080513&content_id=2690487&vkey=news_mil&fext=.jsp&c_id=mil
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Little League bats can be as short as 25 inches, and high school bats are usually 32 or 33 inches. Major League Baseball bats must measure no more than 42 inches (1067 millimetres) in length.