Flexible plastic films make up one of the largest fractions of the waste stream and recycling is one of the most important actions to deal with this fraction and reduce the impact of these plastics on the environment. However, the recyclability of the multilayer films is not straightforward, and in most of the cases these fractions are landfilled or incinerated. The difficulties with recycling the mixed polymers together with the low mechanical properties of the recycled polymer blends have made researchers look to other, new solutions for recycling such as the concept of microfibrillar composites (MFCs). The MFC concept has shown many advantages in different fields. To successfully produce the MFCs, two polymers should be immiscible and have a sufficient difference in their melting temperature. In this field, improving the recycled blends via compatibilization has been already studied, therefore applying the MFC concept to recycled multilayers would be an innovative added value. To this end, a mixture based on polypropylene (PP) and poly(ethylene terephthalate) (PET) was used in this study. The MFC samples were produced at a weight ratio of 80/20 PP/PET by conical twin screw extrusion, followed by thermoforming. Structural characterization of the MFC samples was performed by secondary electron microscopy (SEM), Raman spectroscopy and small angle light scattering (SALS). In order to discuss the relationships between structural and mechanical performances, the strength and stiffness of MFCs were studied. Keywords: microfibrillar composites, morphology, mechanical properties, packaging materials