Biodegradable vs Compostable: What's the Difference?

Biodegradable means a material can break down naturally over time. Compostable means it breaks down into nutrient-rich organic matter within a specific timeframe and under specific conditions. Usually it’s 90 to 180 days. This difference matters for any brand selling physical products. Picking the wrong claim can mislead customers and even cause legal trouble under the FTC Green Guides.

This guide explains biodegradable vs compostable in plain language, shows what each term really means for packaging, and helps you pick the right sustainable mailer for your business.

Biodegradable vs Compostable: The Short Answer

Biodegradable means a material can break down naturally over time. And compostable means it breaks down into nutrient-rich organic matter within a specific timeframe and under specific conditions, usually 90 to 180 days. Here is the main point: all compostable materials are biodegradable, but not all biodegradable materials are compostable. 

This matters because vague claims can mislead. The FTC Green Guides now treat unproven "biodegradable" claims as deceptive. The rest of this guide covers three parts: definitions, breakdown conditions, and how to choose packaging for your products.

Biodegradable vs Compostable: Quick Comparison Table

Biodegradable and compostable packaging differ in breakdown time, certification requirements, end products, and disposal conditions. For online brands, compostable works best when customers have access to composting facilities. Biodegradable is a weaker claim unless you can prove the material fully breaks down within one year. Here is a one-line verdict. Compostable is regulated and trustworthy; biodegradable is vague and risky without proof.

Comparison Table: Biodegradable vs Compostable

What Does Biodegradable Mean?

Biodegradable means a material can be broken down by tiny organisms like bacteria, fungi, or other living things into simpler natural substances over time. This sounds good. But the term is very broad. Paper, wood, cotton, and many bioplastics are biodegradable. So is a steel can, but that takes 50 years or more.

The real problem is time. There is no legal or industry-wide definition of how long "biodegradable" should take. That makes the term mostly unregulated. Another issue is what gets left behind. Some biodegradable plastics break down only into smaller pieces called microplastics rather than fully returning to the earth.

The FTC Green Guides require that "biodegradable" claims come with proof that the product will fully break down within one year under normal disposal conditions. Vague or unproven claims are seen as deceptive. Biodegradable is not bad. But it is vague. That is why compostable certifications were created in the first place.

What Does Compostable Mean?

Compostable means a material breaks down into nutrient-rich soil (compost) within a specific timeframe and under specific composting conditions. And it does so without leaving toxic residue. Unlike biodegradable, compostable is a regulated, certifiable category.

The main certifications to know are ASTM D6400 for compostable plastics, ASTM D6868 for compostable coated paper and packaging, BPI (Biodegradable Products Institute), which certifies products meet ASTM standards, and OK Compost from TÜV Austria as the European version.

There are two types of compostable materials. Industrial compostable needs commercial composting facilities with high heat, controlled moisture, and specific tiny organisms. Most certified compostable plastics fall here. Home compostable breaks down in a backyard compost bin within 6 to 12 months under lower heat conditions.

Here is the access problem. Only about 27% of US households have access to industrial composting. Which matters for brand honesty. If you claim compostable, you may need to tell customers how to actually get rid of it.

Compostable vs Biodegradable Packaging: Real Examples

Most sustainable packaging on the market today falls into one of three real-world categories (recyclable, biodegradable, or compostable), and the differences show up in the materials brands actually buy. Here are examples of each.

Biodegradable Packaging Examples

Recycled paper mailers use paper that breaks down, but at different speeds based on moisture and tiny organisms. Bioplastic poly mailers made from PLA or PBAT are biodegradable but need specific conditions like UV light or heat. Mushroom packaging, which is mycelium-based void fill, breaks down in just a few weeks. Cornstarch-based packing peanuts dissolve in water and break down, though most are not certified compostable.

Compostable Packaging Examples

Certified compostable poly mailers often use PBAT and PLA blends with BPI certification. Compostable bubble mailers combine a paper outside with plant starch inside cushioning. Compostable garment bags work well for clothing brands shipping directly to customers. Compostable shipping labels and stickers are the most overlooked category. But they matter if you want the whole package to be compostable.

Where Most Brands Get It Wrong

Calling a recycled poly mailer "biodegradable" without proof is an FTC violation risk. Calling a bioplastic mailer "compostable" without certification misleads customers. Not saying home versus industrial compostability breaks FTC Green Guides rules.

When Should Brands Use Compostable vs Biodegradable Packaging?

Choose compostable packaging when your customers can realistically get rid of it the right way, and biodegradable options when you need flexibility but can back up the claim. Here is a simple way to decide.

First, look at your customer type. Eco-forward online customers are more likely to have compost access. Mainstream customers usually do not. Second, think about your product type. Food, beauty, and supplement brands benefit most from compostable claims because of a natural lifestyle fit. Third, check your packaging type. Compostable mailers and tissue paper work well. Compostable rigid boxes are still rare and costly. Fourth, decide what marketing claims you want to make. Compostable is a stronger story but requires honest talk about disposal.

Always order free samples before buying a large compostable run. Test how the mailers hold up during shipping, especially in heat or humidity.

Sustainable Packaging Recommendations by Industry

Common Misconceptions About Biodegradable and Compostable

Several false ideas about biodegradable and compostable packaging persist. And a few of them can land brands in legal trouble. Here are the ones to watch for.

Myth 1: "Biodegradable means good for the environment." 

Reality: Some biodegradable plastics break down into microplastics, which harm sea life. The EPA has written about this problem.

Myth 2: "Compostable means I can throw it in the woods." 

Reality: Most certified compostable plastics need industrial composting facilities to break down the right way. Backyard piles do not get hot enough.

Myth 3: "Compostable and biodegradable are the same thing." 

Reality: All compostable items are biodegradable. But very few biodegradable items are certified compostable. The certification gap is the key difference.

Myth 4: "If it says biodegradable, it's a proven claim." 

Reality: There is no common standard for biodegradability. Which is why the FTC goes after vague or unproven claims. The FTC Green Guides are the trusted source here.

How to Choose Sustainable Packaging for Your Brand

Choosing between biodegradable and compostable packaging comes down to three questions. Can your customers get rid of it the right way? Can you prove the marketing claim? Does the format fit your product?

Start with recyclable options if you are new to sustainable packaging. Recycling is the easiest path for most customers. Move to compostable mailers if your customer base cares about the environment, and you can explain disposal clearly through email or inserts. Be careful with biodegradable-only claims. Make sure they meet FTC rules, which require proof of full breakdown within one year.

The most sustainable packaging is usually the right-sized packaging. Using less material altogether often beats swapping materials. A smaller box with less stuffing has a lower carbon footprint than a perfectly compostable box, which is twice as big.

Where to Order Sustainable Mailer Boxes and Mailers

When you are ready to buy, focus on suppliers that offer real certifications, not just marketing talk. Look for BPI certification, ASTM standards, or OK Compost labels. Avoid vague "biodegradable" claims without proof. Check minimum order amounts. Low MOQs let you test before scaling up. Ask about materials. Recycled content, FSC certification, and plant-based resins all matter.

Trusted packaging providers like Arka offer a full line of certified sustainable options. Arka provides low MOQs starting at 10 units. The product line includes FSC-certified corrugated mailers, 100% compostable padded bubble mailers, and recycled honeycomb mailers. All come with instant online pricing and fast US-based production, and you can order free samples before buying a full run.

Arka also offers recycled paper mailers, compostable garment bags, and custom tissue paper for a complete sustainable packaging setup.

Frequently Asked Questions

Is biodegradable the same as compostable?

No. All compostable materials are biodegradable. But not all biodegradable materials are compostable. Compostable means a product breaks down into nutrient-rich soil within a set time (90 to 180 days) under certain conditions. Biodegradable simply means it eventually breaks down without a set time or end product rule.

How long does it take for biodegradable packaging to break down?

There is no single answer. Some biodegradable packaging, like paper, breaks down within months. Others, like bioplastics, can take years and may need specific conditions like UV light or tiny organisms. The FTC Green Guides require that biodegradable claims be backed by proof that the product fully breaks down within one year under normal disposal conditions.

Can I put compostable mailers in my home compost?

It depends on the certification. Look for "home compostable" or "OK Compost HOME" certification. These break down in lower-heat backyard compost bins within 6 to 12 months. Most certified compostable mailers need industrial composting facilities, which use higher heat and controlled conditions. Always check the certification label before composting at home.

Are compostable poly mailers actually better for the environment?

Yes, when disposed of the right way. Compostable poly mailers leave no toxic residue and return to the soil as organic matter. But if sent to a landfill, they can still create methane like other food waste. Their environmental benefit depends entirely on whether your customers have access to composting facilities or home compost systems.

Is biodegradable packaging legal to claim?

Yes. But with rules. The FTC Green Guides require any "biodegradable" claim to be backed by reliable scientific proof that the whole product fully breaks down within one year under normal disposal conditions, which usually means a landfill. Vague, unproven, or unsupported biodegradable claims are seen as deceptive marketing and have led to multiple FTC enforcement actions.