Paper tin-tie bags are most often used as a retail take away bag or for short term storage. PLA or Polylactic Acid, is a clear, crisp film made from the sugars in corn starch. This product works well for items with a higher oil content, as the PLA liner will help keep product from wicking through the outer paper. In PBi lab testing, the PLA bags biodegraded in less than a month in our composter. We recommend removing the tin-tie prior to composting.