Product Specifications
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Material: Heavy-duty, co-extruded polyethylene plastic
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Dimensions: 9 x 12 inches (Usable space excluding the sealing flap)
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Thickness: High-density 2.85 Mil gauge for superior strength
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Closure Style: High-strength peel-and-seal adhesive strip
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Color Options: Classic Outer White (with a privacy-shielding silver inner lining) or Deep Solid Black
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Durability: Fully water-resistant, puncture-proof, and tear-resistant
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Package Options: Available for wholesale bulk purchase
9 x 12 Poly Mailer Overview
Streamline your business shipping process with our premium 9 x 12 wholesale plastic mailers. Engineered specifically for online business owners, e-commerce boutiques, and fulfillment departments, these high-density mailing envelopes offer a flawless balance of lightweight performance and rugged protection. Designed to securely house soft apparel, documents, thin books, textiles, and miscellaneous non-fragile goods, they ensure your merchandise arrives at your customer's doorstep in pristine condition. By cutting down on unnecessary volumetric weight, these mailers help save on postage costs while maximizing your daily packing efficiency.
Premium Plastic Mailer Features & Benefits
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Industrial Strength 2.85 Mil Protection: Significantly thicker than standard marketplace mailing bags, our 2.85 Mil poly mailers are heavily reinforced to survive rough handling, automated sorting belts, and friction without stretching or tearing.
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Weatherproof & Water-Resistant Shield: Rain, snow, and dirt stand no chance. The tightly bonded polyethylene composition keeps moisture, dust, and grime far away from your products during long transit routes.
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Tamper-Evident Security Seal: The hot-melt, pressure-sensitive adhesive closure forms an unbreakable bond once pressed shut. Any unauthorized attempt to open the bag will visibly tear the plastic, keeping your contents strictly confidential and safe from theft.
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Complete Privacy Lining: Featuring an opaque exterior and a specialized dark inner lining layer, these envelopes fully conceal what is stored inside, ensuring total buyer confidentiality.
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Effortless Label & Ink Adhesion: The smooth outer surface is specifically treated so that shipping labels, barcodes, stamps, and permanent marker inks stick permanently without smudging or peeling away mid-transit.
Ideal E-Commerce Shipping Use Cases
These 9 x 12 plastic envelopes are perfectly scaled for flat or flexible retail goods that do not require bulky padded cushioning. They are highly recommended for:
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Apparel & Fashion Boutique Shipping: Excellent for single folded t-shirts, summer dresses, light hoodies, swimwear, leggings, and children’s clothing.
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Business Documentation & Media: Safe transport for flat catalogs, softcover journals, textiles, corporate documents, and art prints.
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Accessories & Soft Goods: Packing handmade fabric crafts, yarn, small plush toys, and soft accessories seamlessly.
Why Choose Shop Backpacks Online?
At Shop Backpacks Online, we know that reliable packaging is a direct reflection of your business's professionalism. We source and manufacture our shipping supplies to rigorous industrial standards, eliminating the flimsy quality associated with entry-level marketplace alternatives. By providing a clean, professional aesthetic alongside true multi-layer protection, our wholesale plastic mailers safeguard your brand’s reputation while providing the absolute best value per unit.
