MAILERS4U 12 x 15.5 Inches Poly Shipping Envelopes/Self Sealing Bags, 2.4 Mil, 100-Count (12x15.5-PM-G60-100PK) Poly Self Sealing Privacy Mailer Envelopes Grey Outer Color & Black Inner Color Strong 2.4Mil Thickness Poly Lightweight, Durable, Professional, and Private! Self Sealing for Easy & Secure package!