These bags are made from a compostable material, Mater-Bi. They are GMO free and will compost as naturally as the fruit and vegetable scraps inside. BioBags meet the ASTM D6400 specification. BPI Certification #891053, which is the gold standard for compostable plastic. Box of 50 bags, 6 liter capacity. When all the right people, and ingredients, kitchen tools, and food come together, we call this The Art of Gathering. Brand RSVP.