... has strong tension strength& abrasion resistant,etc.4. Polyester provide puncture resistant ,if necessary,we can add it ... 2.5kg,5kg,15kg,20kg etc.Description Material constructionBopp/polyester(outside layer):Excellent printing surface,Provide puncture strength. ... up pouch, ziplock bags, heat-sealed bag,mid sealed flat bags, quad pouch,spouted bag,roll stock film,three-side-sealed, with handle ...