If You Care Certified Compostable Food Waste Bags are made from 100% GMO free potato starch in a fully compostable composition. These bags are all natural -- completely polyethylene free and plasticizer free. If You Care Compostable Bags are stronger than bags made from corn starch. The potato starch used to make these bags come from starch potatoes, which are not grown for food but only for starch production. These potatoes are too high in starch to be good for food. Therefore, there is no diversion from food supplies. To produce the same amount of starch from these potatoes as from corn requires 40% less land. These potatoes require no irrigation, and need only normal rainfall. Corn requires much more water. If You Care Food Waste Bags are for food waste only. They are perfect for kitchen compost pails. Line compost pails with bags to collect food scraps and food waste. Bags along with food scraps can be composted in municipal or commercial compost facilities.