... need protections. Unlike other Shipping Supplies, Poly Mailing Envelopes do not contain any bubble, foam or paper ... suits, shoes, books, magazines, etc. Plastic Mailing Envelopes come in a wide variety of thicknesses, colors, and ... white or gray. The sizes for Poly Mailer Envelopes range from 5" x 7" all the way up to ... 26" x26 ". The size of the Mailing Envelopes are ...