When distributing fresh fish, it is critical to use containers or boxes that maintain the cold chain to avoid spoilage and guarantee freshness. Expanded polystyrene (EPS) boxes are usually used with this purpose. These contribute to the vast amount of plastic waste generated and are a major threat to the environment. An increasingly stringent regulation on plastic waste (including the possibility of EU policies limiting EPS use) and a growing demand from consumers for sustainable practices are driving fish producers to look for plastic-free and eco-friendly packaging alternatives. However, currently available options on the market still fail either on performance or cost. The overall objective of the project is to offer fish producers an alternative to EPS based on eco-friendly insulation boxes, from widely available materials such as sheep wool and cardboard, and leverage the latest developments in bio-based coatings.