The term bellows is used by extension for a flexible bag whose volume can be changed by compression or expansion, but not used to deliver air. For example, the light-tight (but not airtight) bag allowing the distance between the lens and film of a folding photographic camera to be varied is called a bellows.
What NFL has lost the Super Bowl the most? The Buffalo Bills, the Denver Broncos, the Minnesota Vikings, and the New England Patriots have all lost four Super Bowls. Edit
Of the 13 teams that have never won the Super Bowl, four (4) are expansion franchises younger than the Super Bowl itself (Bengals, Panthers, Jaguars, and Texans). The Falcons were enfranchised the season the Super Bowls began.