As global e-commerce continues to grow, so does the demand for environmentally responsible packaging. For brands looking to reduce their carbon footprint and appeal to eco-conscious consumers, compostable mailers offer a smart and sustainable solution. But what exactly are compostable mailers? How do they work, and how do they compare to biodegradable options?
This comprehensive guide covers everything you need to know — from materials and benefits to certifications and supplier recommendations.
What Are Compostable Mailers?
Compostable mailers are shipping bags made from plant-based or biodegradable materials that break down naturally in composting environments. Unlike traditional plastic poly mailers, which can take hundreds of years to degrade, compostable mailers decompose into natural elements like water, carbon dioxide, and biomass—leaving no toxic residue behind.
These mailers are designed for e-commerce businesses looking for an eco-friendly alternative to standard plastic packaging. They serve the same purpose—protecting goods during transit—but with the added benefit of being environmentally responsible.
Materials Used:
- PLA (Polylactic Acid): Derived from corn starch or sugarcane
- PBAT (Polybutylene Adipate Terephthalate): A biodegradable plastic that adds flexibility
- Cornstarch-based blends: A renewable, compostable material often used in bag film
These components combine to create a mailer that mimics plastic’s strength and durability but decomposes under composting conditions within 90–180 days.
Benefits of Using Compostable Mailers
1. Reduces Plastic Waste
Plastic packaging is one of the largest contributors to pollution, especially in the oceans. Compostable mailers help eliminate single-use plastics, providing a sustainable end-of-life solution.
2. Eco-Friendly Branding
Customers today care about sustainability. Packaging your products in compostable mailers signals that your brand values the planet—building trust and loyalty among environmentally aware consumers.
3. No Harmful Residue
When composted properly, these mailers break down into water, CO₂, and organic material. No microplastics or toxins are left behind.
4. Certifiable Sustainability
Many compostable mailers meet rigorous certification standards (e.g., BPI, TÜV Austria), giving your customers confidence that your claims are backed by science.
5. Customizable Design
Compostable mailers can be customized with your brand logo, colors, and messaging. You can maintain a strong brand identity while going green.
6. Lightweight but Strong
Despite being plant-based, compostable materials offer similar strength to plastic poly mailers. They can handle the rigors of shipping without compromising performance.
Compostable vs. Biodegradable Mailers: What's the Difference?
| Feature | Compostable Mailers | Biodegradable Mailers |
|---|---|---|
| Breaks Down into Soil? | Yes (nutrient-rich compost) | Yes, but may leave residue |
| Composting Timeline | 90–180 days | Varies—can take years |
| Material Type | Plant-based (PLA, PBAT) | May include synthetic plastics |
| Certification | BPI, TÜV, EN13432 | Often uncertified |
| Ideal Disposal | Compost bin (home/industrial) | Landfill or compost (if suitable) |
Certifications
Not all products labeled "eco-friendly" are truly compostable. To ensure you're using certified compostable mailers, look for the following certifications:
BPI Certified Compostable (ASTM D6400)
Issued in North America, BPI certification verifies that the product meets ASTM standards for compostability in industrial facilities.
TÜV Austria OK Compost HOME & INDUSTRIAL
OK Compost HOME means the mailer will break down in a regular backyard compost, while OK Compost INDUSTRIAL certifies performance in commercial composting environments.
EN13432 (EU Standard)
European standard for packaging that ensures complete biodegradation and safe compost output.
AS5810 / AS4736 (Australia)
Australian standards for home and industrial composting of biodegradable plastics.
When sourcing compostable mailers, always ask for copies of certification documents to validate claims.
How to Compost Mailers Properly
1. Check for Certifications
Look for clear labeling (e.g., BPI, OK Compost) to confirm the mailer is truly compostable.
2. Remove Non-Compostable Elements
If your mailer has any plastic labels or non-compostable tape, remove them before composting. Some suppliers offer compostable labels too.
3. Choose the Right Composting Method
- Home composting: Suitable for mailers labeled “OK Compost HOME.”
- Industrial composting: Requires higher temperatures. Ideal for ASTM D6400 or EN13432 certified products.
4. Time to Breakdown
Under the right conditions:
- Home compost: 180 days
- Industrial compost: 90 days
If composted incorrectly (e.g., thrown into landfill), decomposition may slow down significantly.
Custom Compostable Mailers for Your Brand
Whether you're a DTC brand or a high-volume e-commerce seller, custom compostable mailers can help you maintain a consistent and eco-friendly brand image. Key features to look for when sourcing:
Size & Thickness Options
Choose from standard sizes (e.g., A4, A5) or request custom dimensions based on your product type.
Color & Printing
Get your logo printed in eco-friendly ink. Some manufacturers offer up to 8-color printing for custom designs.
Custom MOQ
Many manufacturers offer low minimum order quantities for startups or higher volumes for wholesale buyers.
Add-ons
Options include double adhesive strips for resealing, perforation for easy opening, or compostable inner pouches.
By branding your packaging with sustainable materials, you enhance your customer experience while reinforcing your environmental commitment.
Why Choose Orizon Bio as Your Compostable Mailer Supplier?
At Orizon Bio, we specialize in manufacturing certified compostable packaging solutions. With 16+ years of experience, we’ve served thousands of B2B clients—from sustainable startups to global retailers.
Here’s why leading brands choose us:
- Large-scale production: 20,000㎡ factory with 16 production lines
- Certified quality: BPI, TÜV Austria, EN13432, AS4736, AS5810
- Global reach: Exporting to the USA, Australia, Germany, Spain, Chile, Peru
- OEM & Private Label: Full support for customized packaging solutions
- Sustainable materials: PLA, PBAT, cornstarch blends
Whether you're ordering 10,000 or 1 million compostable mailers, we deliver fast, reliably, and always with compliance documentation.
Conclusion
As consumers push for more eco-conscious practices, compostable mailers have emerged as a sustainable alternative to traditional plastic poly mailers. They offer strength, customizability, and verified compostability—making them a smart choice for e-commerce businesses aiming to reduce environmental impact.
With certified materials, competitive pricing, and the ability to brand your packaging sustainably, switching to compostable mailers is more accessible than ever.
FAQ
Are compostable mailers waterproof?
Yes, many compostable mailers are designed to be water-resistant, though not 100% waterproof like plastic. They protect contents from light moisture during shipping.
Can compostable mailers go into a regular recycling bin?
No. Compostable mailers are not recyclable and should be disposed of in compost bins. Mixing them with recyclables can contaminate recycling streams.
How long do compostable mailers take to decompose?
- In industrial composting: ~90 days
- In home composting: ~180 days
The timeline depends on heat, moisture, and microbial activity.
Are compostable mailers suitable for international shipping?
Yes. High-quality compostable mailers are durable enough for long-distance shipping and can handle standard postal logistics.
Can I get custom printing on compostable mailers?
Absolutely. At Orizon Bio, we offer custom designs, logo printing, and color options using non-toxic, compostable inks.
