CleverDelights 12 x 16 inch poly mailers. 100 pack. Each ultra-strong 2.2 mil polyethylene bag has a self-adhesive strip for your convenience. Simply peel the tape off, seal, and ship! Our premium poly envelopes are tamper and water resistant. Your labels and stamps will have no problem adhering to these bags. Strong and durable. Dimensions shown above do not include the flap.