The 2018 Green Bay Packers did something that had not been done since 2009 in netting a negative yard total from penalties. This is according to NFLpenalties.com. Green Bay was the fifth-worst team in the NFL with 145 more yards assessed than benefited from.
Two of the four teams that had a worse net total made the playoffs so Green Bay's 2018 ranking doesn't necessarily indicate a major issue. In fact, there is no significant correlation between net penalty yardage and overall team success but still better to be on the positive side of the equation.