The historical understanding of design has evolved from a focus on aesthetics and functionality towards a more comprehensive approach that considers its social, economic, and environmental impact. The product design lifecycle typically encompasses several distinct stages, including pre-production, manufacturing, distribution, consumer use, and disposal. Our mixed-methods study explored the integration of product design thinking and cultural values for sustainable development. We recruited 51 participants, consisting of sustainable product designers and consumers with diverse backgrounds. The survey revealed a strong interest in sustainability among participants, with a majority willing to pay a slight premium for eco-friendly products. Designers reported a higher awareness of Life Cycle Assessment (LCA) compared to consumers. Thematic analysis of interviews with designers and consumers highlighted five cultural aspects influencing design considerations: individualism vs. collectivism, masculinity vs. femininity, power distance, long-term vs. short-term orientation, and uncertainty avoidance.  For instance, designers emphasized considering user needs based on cultural values, such as prioritizing personal preferences in individualistic cultures or family needs in collectivistic cultures. In conclusion, this study highlights the importance of considering cultural values when designing sustainable products.