This document summarizes current evidence indicating that oxo-degradable plastic packaging and other plastic packaging with similar additives, which claim to accelerate biodegradation, contradict two fundamental principles of the circular economy: reducing waste and pollution, and maintaining high-value use of products and materials. Despite being marketed as a solution to plastic pollution, oxo-degradable plastic packaging, including carrier bags, does not biodegrade into harmless residues within a short time as claimed by their manufacturers. Instead, they break down into small pieces, including microplastics, which can contribute to microplastic pollution and pose environmental risks, especially in the ocean. Moreover, oxo-degradable plastics are not suitable for long-term reuse, large-scale recycling, or composting.