Unless you were born yesterday, you know that packaged goods usually contain some empty space in the box, bottle, or bag. This has been true for as long as there have been packaged goods. What is relatively new is that consumers—or, rather, a small cadre of specialized plaintiff’s lawyers—are suing over it. But as Newton said, for every action, there is an equal and opposite reaction. And the more that lawyers have inundated courts with these suits, the more aggressively courts have responded to shut the silliness down. This post examines the regulatory underpinnings of these so-called “slack-fill” suits and the many bases that courts have found for letting the air out of them.