We use Oxo-biodegradable bags that are made from 100% degradable plastics that will biodegrade over time once discarded in landfill sites or inadvertently littered in nature. They have an approximate shelf life of 24-36 months and will degrade in as little as 18 months once permanently exposed to the outside elements. These bags are just as sturdy as regular plastic bags and are recyclable with traditional plastics. Oxo-biodegradable bags are also clean and safe. Once biodegraded, only humus, mineral salts and water are left in the soil, all naturally found substances that do not hinder on soil quality. This technology is government approved for food contact and holds the proper certifications in Europe, Asia, Canada and the United States.