Signet's Compostable Mailers are the ultimate eco-friendly alternative to regular plastic mailers. Made from cornstarch and other compostable materials, our Compostable Mailers are certified industrial and home compostable to Australian standards, meaning they will break down and leave nothing behind. Signet’s Compostable Mailers come in four sizes to suit products of any shape and size and break down within 90 days in an industrial environment and 180 days at home!