A poly mailer is a lightweight, flexible plastic or film shipping bag, typically used for shipping soft, non-fragile items like apparel, accessories, and small lightweight products. It’s one of the most common and cost-effective shipping materials in e-commerce, offering a self-sealing adhesive strip for quick, tape-free closure.
Key Characteristics of Poly Mailers
- Lightweight material — significantly lighter than a corrugated box of comparable size, which can meaningfully reduce shipping costs, particularly for carriers that price based on weight
- Self-sealing closure — most poly mailers include a peel-and-stick adhesive strip, eliminating the need for tape
- Water-resistant — standard poly mailer material provides good protection against light moisture and rain during transit, unlike uncoated paper alternatives
- Flexible, non-rigid structure — unlike a box, poly mailers conform to the shape of their contents and don’t offer structural protection against crushing or impact
Common Uses for Poly Mailers
- Apparel shipping — clothing, especially soft-folded items, is one of the most common uses, since garments don’t require rigid structural protection
- Accessories and small lightweight goods — jewelry (when adequately protected internally), small home goods, and similar items
- Documents and printed materials — some businesses use poly mailers for shipping non-fragile printed materials
- Return shipping — many poly mailers include a secondary adhesive strip specifically for easy return shipping
Custom Printed Poly Mailers
Like other packaging types, poly mailers can be custom printed with a company’s logo, brand colors, and design elements — turning what would otherwise be an unbranded plastic bag into a recognizable, on-brand shipping touchpoint, often at a notably lower cost than a comparable custom printed box.
Poly Mailer Materials: Traditional vs. Eco-Friendly
- Traditional poly mailers — made from polyethylene plastic film, durable and cost-effective but not biodegradable
- Recycled poly mailers — made partially or fully from recycled plastic content, reducing (though not eliminating) environmental impact
- Compostable/biodegradable mailers — made from plant-based materials designed to break down under proper composting conditions, an increasingly popular option for sustainability-focused brands
Limitations of Poly Mailers
- No structural protection — not suitable for fragile, breakable, or rigid items that need impact protection during shipping
- Less premium unboxing feel compared to a mailer box, which may matter for brands prioritizing a more elevated unboxing experience
- Environmental considerations, particularly with traditional plastic versions, unless using a recycled or compostable alternative
The Bottom Line
Poly mailers are a practical, cost-effective, and lightweight shipping solution well-suited to soft, non-fragile products like apparel. Custom printing turns them into an affordable branding opportunity, and the growing availability of recycled and compostable options makes them a viable choice even for sustainability-conscious businesses, provided the product itself doesn’t require rigid structural protection.
