If You Care Compostable Trash Bags are made from potato starch from non-GMO starch potatoes blended with a certified, fully compostable polymer. No plasticizers are added. Starch is a mixture of a linear (amylose) and a branched (amylopectin) polymer of glucose. Potato starch has a higher percentage of amylopectin than either corn or wheat starch. Amylopectin gives starch its structural integrity, so it helps make If You Care Compostable Trash Bags stronger than bags made from corn starch.