The paper linked here explores the potential of PLA/PBSA blend films as sustainable food packaging alternatives to petroleum-based plastics, focusing on applications in high-moisture environments. PLA is biobased and compostable but suffers from brittleness and poor moisture resistance. Four blend ratios (PLA/PBSA: 30/70, 40/60, 50/50, 60/40 wt%) were produced and analyzed for thermal, mechanical, and morphological properties using techniques such as FTIR, SEM, DSC, DMTA, and tensile testing. Moisture barrier performance was tested by sealing fresh whey at 4 °C for 30 days. Results showed that increasing PBSA content reduced tensile strength and storage modulus but affected elongation at break non-linearly, indicating complex morphology-mechanical interactions. The research promises formulations for future biodegradable packaging in refrigerated, high-humidity conditions.