BioBag is the world's largest selling brand of certified compostable bags made from the material, Mater-Bi. The 6-liter size fit most kitchen compost pails and compost as naturally as the fruit and vegetable scraps inside. No polyethylene is used in the production of this product. BioBags are OK compost certified for restricted use of metals in the inks and dyes. BioBags meet the ASTM D6400 requirements, which is the gold standard for compostable plastic. BioBags are shelf stable, just like paper towels, yet compost quickly when exposed to natures elements and micro-organisms, leaving no harmful residues behind.