These BPI certified bags meet stringent requirements of municipal composting programs and ASTM D6400. In addition to US industry compostable standards authority, they also meet strict European VINCOTTE requirement for backyard composting. Size 9 X 13 inches; extra thick 0.8 Milliliters; 15 bags per roll. Bags are leak proof. Use within 9 months of purchase. Avoid excessive heat, and store in a cool and dry place.