Manually removable seal for buckets and cans

A bucket lid made of flexible plastic, said lid defining an annular peripheral gripping channel for receiving and holding the lip of the bucket, said gripping channel defining an outer and inner wall, said bucket lid also defining an annular inner channel defined by the wall of the lid and projecting outwardly therefrom relative to an attached bucket, said inner channel being positioned radially inside of and adjacent said gripping channel, whereby manual depression of a point of said inner channel causes a portion of the outer wall of the gripping channel to disengage a bucket lip retained in said gripping channel, permitting the lid to be peeled off of the bucket for opening, said inner channel defining an annular, straight outer wall which extends radially outwardly at an angle of essentially 20.degree. to 60.degree. from the axis of a bucket attached to said lid toward junction with the gripping channel, the inner wall of the gripping channel and the outer wall of the inner channel defining at said junction an annular apex which projects inwardly of the bucket lid toward the side facing a bucket attached thereto, whereby said apex assists to center the bucket lid on a bucket during automated filling and closing processes.