Kodiak Pack Insulated Mailer Metalized Envelopes for Cold Shipping, 9" x 12" - 50/Case Kodiak Pack features a multi-layered metalized film composite exterior that reflects 97% of radiant heat. Features an airtight payload chamber with heavy duty FDA approved ziplock closure and a flap down sealing tape. Cost effective cold chain system ensures that your valuable temperature sensitive payloads arrive in optimum condition. Superior seam strength creates airtight construction and crush resistant bladders. Size: 9" x 12" (Inner Dimensions). 50/Case.