Sustainable and Renewable Corn Starch Bio-Plastic Polymer Resin. Making it the strongest Biobase Non-Woven Bag on the Market! Sustainable Solution to Non-Toxic Reusable Shopping Bags. 100% Compostable and Biodegradable. Certified Compostable Ok Compost Vincotte. Australian Standards AS4736 BPI and AS5810 Home compost. GMO Free! 100 units in box.