The leather industry is experiencing a significant rise in production, resulting in an increase in discarded materials–often classified as urban waste—that end up in landfills or are incinerated. Given the geographical proximity of the leather goods sector in Ubrique to the cork stopper manufacturing industry in El Puerto de Santa María/Jerez and to the viticulture sector in Jerez/Sanlúcar/Chiclana, it is essential to explore synergies that can address environmental challenges by contemplating a circular economy approach. This study focuses on the existing potential of repurposing discarded materials, such as reinforcements and linings, by meticulously recording, classifying, and characterizing them. The aim is to valorize these by-products in line with the circular economy principles set out by the European Union. Specifically, the research investigates the feasibility of using these materials as raw inputs, in combination with resins, to produce bottle stoppers for the high-end spirits industry. Findings indicate that a single company generates over six tons of textile waste per month, which equates to approximately EUR 25,000 annually in landfill disposal costs. By implementing a circular alternative that uses just 8.75% of these materials, an economic saving of around EUR 750 per year was reached. In addition, a low-cost vacuum molding method was tested for producing stoppers, yielding aesthetically pleasing and durable prototypes. The application of a materials circularity index enabled the identification of optimal remnants for reintroduction into the production cycle. This re-integration not only reduces the reliance on virgin plastic materials, but also has the potential to significantly reduce the overall environmental impact across interconnected sectors. Ultimately, this study highlights the viability of adopting circular economy practices within the leather goods sector to promote sustainability and economic efficiency. [ABSTRACT FROM AUTHOR]