Side Loading Mailers 29 ECT (Edge Crush Test) #3 White Outside, Kraft Inside Side loading mailer features self-adhesive strips for quick and secure closure. Perforated tear strip for easy opening. Shipped in protective corrugated carton. All Air Express Standard Mailers are E-flute
Triangular Mailer 32 ECT (Edge Crush Test) #3 White Outside, Kraft Inside. Triangular Mailer features self-adhesive strips for quick secure closure. Perforated tear strip for easy opening. Shipped fully assembled in clear protective wrap. All Air Express Triangular Mailers are B-flute.