Once mechanical behavior of TPS films was studied, the feasi- bility to develop packaging bags for food products was evaluated. Thus, films thermo-sealing capacity was studied in first instance. TPS films and composites containing talc nanoparticles were able to be thermo-sealed obtaining a good quality seal. This could be attributed to the disappearance of the interface between both in- dividual layers, due to their high molecular interaction, allowing to form a new homogenous layer (Cho et al., 2007). TPS films thermo- sealing resistance, which determines package integrity, was studied by tensile tests. Fig. 2 shows tested specimen’s photographs of TPS films and its bionanocomposite containing 5% w/w talc particles, as well as the corresponding stress-strain curves. Talc addition modified the failure mode of TPS films. Break near the seal was detected for TPS films while adhesive-cohesive failure was found for films with talc nanoparticles (Fig. 2A and B). Stress-strain curves shown in Fig. 2C were in agreement with the observed failure modes (López et al., 2011). TPS film’s failure mode revealed that the corresponding juncture was resistant enough to bear the applied