during the closure process fig5 7 depict representative configurations for an audible closure indicator 60 in accordance with the present invention and more particularly representative approaches for the arrangement of encapsulated gas within the material fig5 depicts one embodiment of a material suitable for use as an audible closure indicator 60 in accordance with the present invention in this embodiment the encapsulated gas is contained within one or more preferably a plurality of discrete bubble like compartments 61 within the material these compartments may be distributed randomly or regularly throughout the material or may be grouped into zones or patterns and may project outwardly beyond the general plane of the material or may be contained within the material below its outer surface the material may be designed such that the material ruptures in one or more locations to release the gas from the compartments when compressed such as during the closure operation or discrete apertures may be formed such that the compartments are in fluid communication therewith the compartments with the encapsulated gas therein may be formed such as by entraining air or other gas as the material is formed or by forming a laminate of multiple material elements at least one of which is shaped so as to trap air therebetween delamination of laminated.