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Durable 16×21 bags poly crafted from tear-resistant LDPE, our Mailing Poly Bags in elegant Grey Mailing Bag design feature a secure self-adhesive strip for quick closure. Lightweight yet moisture-proof and opaque for privacy, multi-layer construction protects against punctures while reducing postage weight. Ideal for e-commerce, courier shipping, and postal use—built for strong, reliable performance every time.