They 've won 11 NFL Championships and four Super Bowls over that time span .
Since the Green Bay Packers joined the National Football League in 1921 , they 've been one of the most successful franchises around .
one 've won 11 National Football League Championships and four Super Bowls over that time span .
Since the Green Bay Packers joined the National Football League in 1921 , they 've been one of the most successful franchises around .