There have been other approaches to scavenging oxygen from food packs or to enhancing the barries of the packs such as bottles. These have generally included variants on those mentioned here, and some have been reviewed elsewhere (Rooney, 1995; Brody et al., 2001). The process that have progressed to the market or which are undergoing commercial development are described in ever increasing detail in the forest of patent applications that have been published . Despite the density of this forest, it is clear that several different food distribution problems can be solved by using these scavengers. These problems have their genesis in the nature of the newer packages as well as the requirements of high- speed filling and the use of distribution temperatures that impose demands upon the packaging. Perhaps the greatest demand has been made by the shift from glass and metal cans to substantially plastic pack.