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Custom Expandable Mailer Bags

Introducing our custom expandable mailer bags, the perfect packaging solution for shipping items of various sizes. These innovative expandable kraft mailers are designed to expand, providing flexibility and protection for your products.

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Super-Fast Deliver

3D Design Studio


Unsure which packaging suits your project the best? Have our experts help guide you!

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Additional information


All Custom Sizes & Shapes


Any custom quantity, higher the quantity = lower the price per unit

Paper Stock

10pt to 28pt (60lb to 400lb) Eco-Friendly Kraft, E-flute Corrugated, Bux Board, Cardstock


No Printing, CMYK, CMYK + 1 PMS color, CMYK + 2 PMS colors


Gloss Lamination, Matte Lamination, Gloss AQ, Gloss UV, Matte UV, Spot UV, Embossing, Foiling

Included Options

Die Cutting, Gluing, Scored,Perforation

Addition Option

Eco-Friendly, Recycled Boxes, Biodegradable


Flat View, 3D Mock-up, Physical Sampling (On request)


4-8 Business Days



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Why Should You Invest In Our Custom Expandable Mailer Bags? 

When it comes to shipping your products, the right packaging can make all the difference. That’s why we highly recommend investing in our custom expandable mailer bags. Here are the top reasons why these bags are a smart choice for your business: 

Customization Options For Custom Expandable Mailers 

We believe that your packaging should reflect your brand and leave a lasting impression on your customers. That’s why we offer customization options for our custom expandable mailers. From choosing the size and color to adding your logo, branding, or promotional messages, our team will work closely with you to create personalize mailer bags that align with your brand identity and enhance brand recognition.

Convenience And Security Of Custom Expandable Mailer Bags 

Our custom expandable mailer bags are design with ease of use in mind. They feature a self-sealing adhesive strip that provides a hassle-free and secure closure, eliminating the need for additional sealing materials.

This convenient sealing mechanism ensures that your products remain protected throughout the shipping process, providing peace of mind for both you and your customers.

Investing in our mailer bags is a smart choice for businesses looking to optimize their shipping process, protect their products, and enhance their brand image.

With their versatility, superior protection, cost-efficiency, customization options, and convenient features, these mailer bags are the ideal packaging solution for your shipping needs. Choose quality, choose reliability, and choose our mailer bags. 

Get A Range Of Coating Options For Custom Expandable Paper Mailers 

When it comes to creating visually appealing and standout custom expandable paper mailers, choosing the right coating method can make all the difference.

At Packaging Mines, we offer a variety of coating options for our custom expandable mailer bags. Let’s explore these coating methods and their unique characteristics: 

Matte Coating 

Matte coating provides a smooth and non-reflective finish to the surface of the mailer bags. This coating option adds a touch of elegance and sophistication to your expandable custom poly mailers. The matte finish reduces glare and creates a subtle, modest look that is ideal for conveying a sleek and modern aesthetic. 

Gloss Coating 

Gloss coating, on the other hand, offers a shiny and reflective surface, providing a vibrant and eye-catching appearance to mailer bags. This coating option enhances the colors and details of your design, making it pop and grab attention. Gloss coating is perfect for creating a classy and professional look that stands out.

Spot UV 

Spot UV coating involves applying a glossy and raised finish to specific areas of the mailer bags, creating a contrast between the coated and uncoated parts.

This technique adds a tactile and visually striking element to your custom printed expandable mailer, making certain elements or patterns stand out.

Spot UV coating is often use to highlight logos, brand names, or specific design details, adding an extra touch of luxury and sophistication. 


Embossing is a technique that creates a raised design or pattern on the surface of the mailer bags. It adds depth and texture to the packaging, providing a premium and tactile experience. Embossing is often use to highlight logos or brand elements, giving them a three-dimensional effect that elevates the overall look and feel of the packaging. 


Debossing, on the other hand, creates an indented or recessed design on the surface of the mailer bags. This technique adds a subtle and sophisticated texture to the packaging, making it visually intriguing and captivating. Debossing is commonly used for logos, patterns, or text, giving them a subtle elegance and making them visually distinctive.

Each coating method offers its own unique benefits and can combine to create a truly customize and visually stunning packaging solution.

Our team of experts will work closely with you to determine the best coating options for your custom expandable mailer bags, ensuring that they align with your branding goals and create a lasting impression on your customers.

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With These Wide Options

Never worry about going to multiple sources to get your dream packaging.
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Frequently Asked Question & Answers

  • Can I Customize The Size And Dimensions Of The Mailer Bags?

    Absolutely! We understand that every product has unique packaging requirements. That’s why we offer customization options for our mailer bags, including the size and dimensions. Whether you need small bags for lightweight items or larger ones for bulkier products, we can create mailer bags that perfectly fit your needs.

  • Are The Mailer Bags Durable Enough To Protect My Products During Shipping?

    Yes, our mailer bags are designed with durability in mind. We use high-quality materials that provide excellent protection for your products during transit. Our mailer bags are resistant to punctures, tears, and moisture, ensuring that your items reach their destination safely and intact.

  • Can I Add Branding Or Custom Designs To The Bags?

    Absolutely! We offer customization options that allow you to add your branding, logo, or custom designs to the custom expandable mailer bags. You can choose to have your artwork printed directly on the bags or opt for custom labels or stickers. Adding your branding helps create a professional and cohesive look for your packaging and enhances brand recognition.

  • Are The Mailer Bags Eco-Friendly And Recyclable?

    Yes, we prioritize sustainability and offer eco-friendly options for our mailer bags. We use materials that are recyclable and made from recycled content. Our mailer bags are designed to minimize waste and environmental impact while providing effective packaging solutions for your products.

  • Can I Order Samples Of The Mailer Bags Before Placing A Larger Order?

    Certainly! We understand the importance of evaluating the quality and suitability of our mailer bags before making a larger commitment. We offer sample orders, allowing you to see and feel the bags firsthand. Contact our customer service team to inquire about sample availability and ordering details.

  • What Is The Minimum Order Quantity For The Mailer Bags?

    The minimum order quantity may vary depending on the specific customization options and bag size. Our team can provide you with detailed information about the minimum order quantity based on your specific requirements.

Looking to power up your branding with custom packaging?