Kodiak Pack features a multi-layered metalized film composite exterior that reflects 97% of radiant heat. Features an airtight payload chamber with heavy duty 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). 5/Case. Improve Payload Protection! Kodiak Pack features a multi-layered metalized film composite exterior that reflects 97% of radiant heat. Features an airtight payload chamber with heavy duty ziplock closure and a flap down sealing tape. Adhesive tape is tamper resistant and designed to maintain its integrity even when envelope is packed in dry ice. 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. Kodiak Pack is insulated with entangled, multi denier fibers in an air still bladder. Chill film and inner PET creates airtight Insulated seams, structural integrity, superior crush resistance and burst strength.