Expansion Poly Mailers
Our expansion poly mailers are a flexible and practical mailing option for shipping bulky or irregularly shaped items. Their bottom gusset allows the bag to expand easily, making them perfect for shipping larger products. Unlike standard flat poly bags, expansion poly mailers offer more internal space while remaining lightweight. They also save on postage costs and simplify packing processes.
Because they are lightweight and moisture-resistant, they are ideal for a broad range of goods, including apparel and fabrics, books, and soft merchandise. Available in 6 different sizes, our expansion poly mailers are a cost-effective and reliable way to fulfill your packaging needs and customer expectations.
Our Collection of Expansion Poly Mailers
What Are Expansion Poly Mailers?
Expansion poly mailers are an upgrade over standard poly mailers, featuring an expandable bottom gusset that allows larger, irregularly shaped items to be placed securely inside. They are made from flexible plastic film with a pleated section running along the bottom. This gusset transforms the flat envelope into a practical, three-dimensional container.
The expansion poly mailer bag is essentially the middle ground between standard flat plastic envelopes and rigid boxes, combining features from both, like adaptability and generous capacity. They are very effective for sending multiple articles together, wider items such as clothing bundles, pliable merchandise, or items with jutting shapes that wouldn't easily fit into conventional envelopes. As they self-adjust to the volume of their contents, they reduce the need for multiple packages or oversized cartons and improve packaging. They also reduce material waste, which makes financial and ecological sense.
Our expansion poly mailers are manufactured from Low-Density Polyethylene (LDPE), a highly flexible and durable material. The mailers are 2.5 mil thick with a side-weld construction. They are strong, have minimal weight, and are very resistant to tearing. Thanks to their sturdy construction, goods will arrive in perfect condition. Our poly mailers feature strong self-adhesive strips that make it easy to close without additional sealing tape.
With a white exterior and silver interior, they have an opaque finish, so the contents are not visible to outsiders. Their shelf life of 5 to 10 years, when stored in a cool, dry place at temperatures below 120°F, means you can stock up and use them as needed.
Poly mailers are a practical and reliable packaging solution for merchants, e-commerce companies, and logistical operations. They are an effective and cost-effective way to ship items, reducing overall shipping weight compared to boxes. They look good, meet customer expectations, and significantly reduce your mailing costs.
In addition, they are a flexible option for many commercial and business requirements. Beyond dispatching products and supplies, you can use them for item returns, internal transfers, or inventory storage.
Why settle for a simple poly mailer? Contact us today to learn more about expansion poly mailers and discuss your needs. We offer discounts for bulk orders, while orders over $799.99 qualify for free shipping.
Everything You Need to Know about Expansion Poly Mailers
What makes expansion poly mailers different from regular poly mailers /poly bags?
Our expansion poly mailers have an expandable gusset, an additional folded section at the bottom. This opens up the mailer so you can add bulky items. The extra capacity and flexibility allow them to accommodate larger or irregularly shaped items, unlike standard flat poly mailers, which do not expand.
What materials are expansion poly mailers made of?
Packaging Friends’ expansion poly mailers are made of Low-Density Polyethylene (LDPE), a plastic material composed of multiple layers that provide excellent strength, durability, moisture resistance, and puncture protection. This thick material keeps the mailer's contents secure during long journeys and remains lightweight, reducing shipping costs.
Are expansion poly mailers waterproof?
While no single packaging is completely waterproof, our expansion poly mailers do resist water to a high degree, blocking moisture more effectively than cardboard or paper packaging. Their polyethylene material repels rain and spills and protects contents from light to moderate exposure during shipping.
What types of products are ideal for these mailers?
Our expansion poly mailers are an excellent packaging solution for clothing, soft goods, textiles, books, accessories, and other bulkier or irregularly shaped items that may not fit into flat mailers. Their expandable design accommodates multiple products or thicker single products perfectly.
Can expansion poly mailers help reduce shipping costs?
Absolutely. Because our mailers are lightweight and adjustable to content volume, they often weigh much less than rigid boxes. This can lower postage costs, especially for lightweight items, and reduces the need for additional packing materials.
How do I seal an expansion poly mailer?
Our expansion poly mailers come with a self-seal adhesive strip. To seal, you simply remove the protective liner and press the adhesive closure to the opposing surface after inserting your items. This creates a secure, tamper-resistant seal without the need for extra tape.