Our dark green-colored bags contain an EPI additive which helps them to break down, unlike traditional plastic bags. As international standards vary by country, and in order to comply with all labeling regulations, we do not label our bags as biodegradable. We do offer certified compostable bags made from vegetable starches and have been BPI-certified and meet both ASTM D6400 and EN13432 guidelines which allows them to be disposed of in a municipal composting facility that accepts pet waste.