Stayflat Plus® Mailers Item Code: Type: Sold By Quantity Mailers Stayflat Plus® Mailers Self-Seal Description Stayflats Plus® Mailers are environmentally responsible and made from 100% recycled paperboard (.028" CCNB) with a minimum of 35% post consumer content; 100% recyclable; keeps products flat during shipping; eliminates need for cardboard stiffeners. Catalog style construction, featuring a secure pressure sensitive closure and tear strip opening. Stock color available: White. Special order color available: Kraft.