<p>The environmental impact of single-use food packaging is a growing concern for policymakers worldwide. In January 2023, the French government introduced a regulation requiring restaurants that can serve at least 20 customers simultaneously to use reusable tableware for onsite dining. The success of such interventions depends on consumer acceptance, particularly in fast-food restaurants where convenience and habit dominate. This study investigates consumer responses to reusable tableware in France and the US using a comparative mixed-method approach, with McDonald’s as the focal context. The findings reveal that reusable tableware acceptance is influenced not only by consumers’ pro-environmental behaviour but also by how reusable tableware shapes their perceptions of societal consumption consequences and personal consumption experience. Furthermore, the results suggest that fast-food retailers can leverage a positive CSR image to support the transition toward reusable tableware. Before gaining firsthand experience, a positive CSR image fosters anticipated acceptance of reusable tableware among less pro-environmental consumers. After gaining firsthand experience, a positive CSR image enhances the personal consumption experience of more pro-environmental consumers, ultimately driving their acceptance of reusable tableware.</p>