Poly Seal 6×9 Hot Pink Poly Mailers 20 Pack 20 new Poly Seal 6×9 hot pink self-sealing poly mailers. These thicker mailers feature a strong adhesive seal and are perfect for shipping clothing, accessories, stickers, crafts, and other non-fragile items. New. Ships fast. #PolyMailers #PolySeal #ShippingSupplies #SmallBusiness #Packaging