Free Tooling and Set up! Custom Display Mailer Boxes are pefect for Kitting, Graduation, Employee onboarding, Retail and Subscriptions services. This 12" x 9" x 4" corrugated cardboard mailer box has an E-Fluted design for added protection in two thicknesses. Choose from standard or premium white or kraft. One or two-sided printing available. Add your school, sports team, organizational or company logo or message to customize. Made from recycled materials.Avail in custom sizes, full color print, order as little as 1 box. Email for a quote.