BioBag Dog-Waste Bags do not contain any polyethylene-based ingredients. They are as natural as dog waste and decompose within 40 days in a well-functioning composting environment. By comparison, it takes more than 100 years for normal plastic bags to decompose. BioBag Dog is certified according to the European Standard EN13432 for compostable products and the US Standard ASTM D6400 for compostable plastics. On behalf of the environment - Thank you ! 8" x 11.4" (folded) 8.5" x 14" (on a roll)