Poopy Packs use EPI additive with our polyblend. The EPI additive is designed to control and manage the lifespan of plastics and reduce their footprint in the environment. Our unique mix of polyblend and additive allow the Poopy Packs to degrade at a controlled rate when the bags are exposed to photo (sunlight), thermal (heat) and/or mechanical stress in the presence of oxygen and causes the plastic to ultimately degrade in the presence of microorganisms, moisture and oxygen into environmentally benign products within a few months.