Clean and affordable energy is a key challenge for sustainable development. Triboelectric nanogenerators (TENGs) provide a low-cost solution, especially when made from repurposed waste materials. This study showcases the reuse of post-consumer snack packaging—specifically, multilayer polymer-metal films with biaxially oriented polypropylene (BOPP) surfaces—as functional dielectric layers in high-output TENGs. The packaging was analyzed using Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), which confirmed that polypropylene (PP) is the primary material used in the dielectric. Four vertical contact–separation single-dielectric TENGs were fabricated using copper and aluminum electrodes paired with snack bags from different brands. The copper-electrode device achieved a maximum open-circuit voltage (V OC) of 1628.0 V PP, and a short-circuit current (I SC) of 112.0 μA, with a peak power density (PD) of 3.3 W/m 2. It delivered a root-mean-square (rms) voltage of 56.5 V and a power density of 11 mW/m 2, sufficient to power up to 327 light-emitting diodes (LEDs) and consumer electronics while maintaining robustness over 2841 cycles. These findings underscore the promise of upcycled snack packaging as a sustainable dielectric material for high-performance energy-harvesting applications.