US Patent 7086551 Plastic container and lid construction

A combination molded plastic bucket and lid includes a series of outwardly extending ribs on the top edge of the bucket and inwardly extending flanges on a depending outer skirt of the lid which engage with the bucket ribs to provide a wedging action that holds the lid tightly in a sealing position on the top of the bucket. A zig-zag tear strip permits removal of a portion of the lowermost lid flange. The top of the bucket includes a groove adapted to receive a projection or tongue seal.