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
The Pittsburgh Steelers have 6 rings. The Dallas Cowboys and San Francisco 49ers each have 5, and the New England Patriots, New York Giants, and Green Bay Packers each have 4. Source: Most Super Bowl wins by NFL team 1967-2016 | Statistic.