Abstract: Packaging wall made of a composite plastic of polymer layers, including: 1) an outer layer of a thermoplastic elastomer chosen from: copolymers of propylene and ethylene which have a Shore D hardness, measured according to ISO standard 868, which is lower than or equal to 40, mixtures of polypropylene homopolymer and of a terpolymer (ethylene, propylene, diene), polyethylene terephthalate elastomers, polyurethane elastomers, copolymers of ethylene and vinyl acetate, and block polyether-polyamides; and 2) an inner layer of a polyolefin which does not have elastomer characteristics and which is impervious to oxygen. The polymers of the layers have a molecular weight such that they can be formed by coextrusion-blow molding.