This innovative packaging for certified organic milk is made of biodegradable thermoplastics and is designed to illustrate the natural quality of the product. The special challenge in this context is to combine material properties with function. The cap functions according to the principle of material tension. To open the carton the tension is released to close it again the tension is restored. A freshness gauge integrated into the packaging material tells the consumer whether the milk is still fresh. When the milk turns sour, the freshness gauge changes color.
