Interlining is extra to provide a padded sensation towards your bag and gives a slight three D effect. Feel a quilted cloth. Other than the same old padded interlining fabric, other supplies like foam, fusible fleece and batting are added as interlining. Consider this write-up on the top lining cloth https://typesofcottonbag03580.designertoblog.com/55838232/the-best-side-of-types-of-cotton-bag