In an era marked by growing environmental concerns and the need for sustainable living, the development of environmentally friendly and biodegradable products has become paramount. This work proposes the preparation of eco-friendly and sustainable value-added products like carry bags and garbage bags from cassava starch. A cassava starch: plasticizer ratio of 1:0.05 has been optimized to prepare bioplastics with good mechanical properties. We have used nearly spherical shaped silver nanoparticles ranging between a particle size of 9–15 nm and spherical zinc oxide nanoparticles ranging between 12 and 38 nm prepared by green methods which were characterized using XRD, SEM and TEM. Using the optimum cassava starch:plasticizer ratio, two sets of bioplastics were prepared-one containing varying amounts of silver nanoparticles and the other with varying amounts of zinc oxide nanoparticles. For both types of bioplastics, 1% nanoparticle addition gave maximum tensile strength of 4.8037 N/mm2 for zinc oxide incorporated bioplastics and 4.3320 N/mm2 for silver incorporated bioplastics. The addition of nanoparticles did not much change the thermal stability of bioplastics. Soil, air and water degradation studies were done for 31 days. The rate of soil degradation increased on nanoparticle addition. The durability of the bioplastics was confirmed during air degradation studies. The nanoparticle incorporated samples showed lesser degradation in air and water. Thus, addition of nanoparticles customizes the properties of bioplastics, making them suitable substitutes for traditional plastics in a wide range of uses.