US Patent 11325760 Die-cut lid and associated container and method

A die-cut lid for closing a container is formed from a flexible composite sheet material. The lid comprises a functional area bearing human-readable and/or machine-readable data. One or more rigidifying indentations are provided on the lid to promote flatness of the functional area in a resting state of the lid. The one or more rigidifying indentations can be in the form of one or more encircling indentations that border the functional area; and/or a planar indentation that encompasses the functional area.