Redi-Strip Poly Expansion Mailer, #4 1/2, Square Flap, Redi-Strip Adhesive Closure, 11 x 13, White, 100/Carton Flexible poly and expansion means everything fits. No matter what the contents include, the durable, windowless mailers will safeguard against inclement weather and handling. Once the Peel & Seal strip is removed, fold down the self-sealing flap for secure closure. Large box comes in handy for busy offices.
