the invention addresses the use of a composite carbon dioxide scavenging filler which has been dispersed uniformly into a polymeric matrix . the resultant layer can then be coated or laminated onto a paper , paperboard , foil , or other substrates . it can also be made into a cast or blown film . the carbon dioxide scavenging structure thus created desirably contains a polymeric matrix binder as the filler dispersion medium , one or more particular carbon dioxide scavenging fillers , one or more moisture producing / retaining agents or moisture retaining agents , and , optionally , one or more polymeric or surfactant dispersion / wetting agents aiding the wetting and the uniform dispersion of the fillers in the matrix . this allows products contained in a package , such as roasted coffee , or produce , to maintain freshness and counteract pressure buildup in a package which results in bulging , rupture , loss of freshness , poor shelf appearance , and increased anaerobic bacterial activity .