SSBM 9 x 11 1/2" White Stayflat Mailer Tab-Lock Original, Rigid Mailing Envelopes 100/Pack

Manufactured from white chipboard. Lightweight to save on postage. No additional stiffeners needed. Tab lock closure. ‌You may also like 10 x 13 x 2" White "Side" Self-Seal Expandable Tyvek® Envelopes 100 Per Case.