Consumers want more simplicity and transparency in order to be able to shop more consciously and in a more eco-friendly way. The M-Check is designed to simplify sustainable shopping for Migros customers. This is thanks to an intuitively understandable rating system on the products. Customer-relevant sustainability dimensions are rated with stars. The scale goes from 1 to 5: the more stars, the more sustainable a product is. On behalf of the Federation of Migros Cooperatives, we have developed an ecologically based rating system for packaging. Four factors are included in the rating based on life cycle assessment considerations: the packaging material, the packaging weight, the proportion of recycled material and recycling after usage. Additional quality assurance was carried out by Empa.