If You Care caddy liners are certified compostable bags made from 100% GMO free potato starch & a fully compostable polymer. These bags are completely polythene free & plasticizer free. Starch is a mixture of a linear (amylose) & 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 Certified Compostable Bags stronger than bags made from corn starch.