Poly Mailers 10” x 13” 20 Count New Durable 10” x 13” self-sealing poly mailers that are lightweight, waterproof, and tear-resistant. Great for shipping clothing, t-shirts, accessories, books, and other non-fragile items. Strong adhesive closure helps keep packages secure during transit. #PolyMailers #ShippingSupplies #SelfSealing #SmallBusiness #PackagingSupply