Abstract: A lid (30) for a disposable beverage container (32). The lid (30) includes at least a region having thermochromic properties which is/are adapted to change color upon reaching a predetermined non-ambient temperature in response to heat transfer from or to contents (40) of the container (32). Also disclosed is a lid (60) including at least one recess (62) having an internal side wall or walls (64) that substantially correspond in size and shape to the external side wall(s) (66) of a container (68). The lid internal side walls (64) are adapted to securely frictionally engage, over substantially their entire surface area, the external side wall(s) (66) of another like container (68).

Abstract: A lid (2) for a container (67), the lid (2) comprising a first plastic layer (15) including a portion having at least one colored pigment and a second plastic layer (14) including at least one thermochromic substance capable of becoming translucent upon reaching a predetermined temperature in response to heat transfer from or to contents of the container so as to reveal the colored pigment of the first layer. Alternatively, there is described a lid comprising a layer with a portion (62,63) that becomes either observable or non-observable at the predetermined temperature.