we develop in Microsoft excle a spreadsheet model that evaluated the impact of different packing schemes for the Benin routine regimen plus the introduction of the Rotarix vaccine. thr Benin routine vzccine regimen includes Bacillus........ Specifically, we used the model to compare thr current packing scheme to that of a proposed modular packaging system. The storage device considered is the Dometric RCW25, which is prequalified by the WHO, is used in over 100 countries and was noted as a commonly used storage device in a recent study of in-country vaccine transport devices