5000 9x12 Poly Mailers Envelopes Self Seal Shipping Bags 2.5 Mil 9" x 12"

2.5 Mil Self-Seal Punture Resistanant Lightweight which saves on postage Approved through all shipping carriersYou may also like 250 Pack 11x13.5 White Rigid Stay Flats Self-Seal Cardboard Envelope Mailers 11"x13.5".