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Liquid cosmetics and pharmaceutics are often filled in plastic bottles, which are mainly produced by blow molding, a cost-effective process. The products often dry out or are contaminated after the opening of the packaging. A solution is to use multi-layered packaging that allow a gradual emptying and are airtight in order to prevent a contamination. However, these containers are not economically affordable for many products and therefore previously used only for highvalue products. As part of the project, the current five-layer structure has to be optimized. The aim is to realize a threelayer structure in which a modified polyamide is used to replace the previous EVOH layer. For the first time, polypropylene and polyamide are combined in an extrusion blow molding process. [ABSTRACT FROM AUTHOR]