2.Airtight payload chamber with heavy duty zip closure and a flap down sealing tape. Thick padded mailers cushion and insulate up to 36 hours. 3.Metallic – 1/2″ very thick foam with metallized poly exterior. Dual closure with leakproof zipper inside and exterior self-seal strip.
4.Insulated with entangled, multi denier fibers in air still bladder.
5.Superior seam strength creates airtight construction and crush resistant bladders.
6.Great for compounding pharmacies and shipping fertility medications.