Self-Sealing Poly Mailer (1.70 MIL) Brand: FS Polyethylene mailer is water, tear, and puncture resistant for maximum protection Self-sealing, peel and stick, adhesive keeps contents secure and tamper proof Surface easily accepts ink, stamps, and labels Approved for USPS, FedEx, UPS, and DHL Size / Dimension Available: #00s / 4″ x 5″ #0s / 5″ x 6″ #1s / 6″ x 8″ #2s / 7.5″ x 9.5″ #3s / 9″ x 11″ #4s / 10″ x 12″ #5s / 12″ x 15.5″ #Hs / 13″ x 15″