Hudson Exchange presents these heavy-duty poly mailers engineered specifically for demanding shipping applications. Each mailer in this case of 100 measures 20 x 30 inches with robust 3.5 mil polyethylene construction that effectively resists tears, punctures, and moisture while remaining lightweight to minimize your postage costs. The self-sealing adhesive closure ensures secure packaging without requiring additional tapes or materials. These white poly mailers feature a smooth surface that readily accepts ink, stamps, and labels without smudging, making addressing and branding simple. The water-resistant properties protect your contents from environmental exposure during transit, while the tamper-evident design helps deter unauthorized access. Perfect for e-commerce businesses, document shipping, and merchandise requiring reliable protection during the shipping process. These versatile mailers provide professional-grade shipping solutions for businesses of all sizes.