Compostable and biodegradable packaging are not the same. Biodegradable means a material can be broken down by microorganisms, but the term does not define how long the process will take or what remains afterward. Compostable means the product can break down into compost, carbon dioxide, water, and biomass under specified composting conditions without leaving toxic residues or persistent plastic fragments.
A biodegradable packaging bag may require months, years, or much longer to break down. A compostable packaging bag must meet defined testing requirements, usually in a commercial composting facility unless it carries a home composting certification. Neither option should be treated as automatically recyclable, landfill-safe, or suitable for marine disposal.
Key Takeaways
- What biodegradable means
- What compostable means
- The difference between compostable and biodegradable
- How compostable products compare with conventional alternatives
- Related environmental topics you may see on packaging
- How to identify greenwashing
- How to choose certified compostable products
- What to consider when buying compostable trash bags
- Frequently asked questions about disposal and certification
What Biodegradable Means
A biodegradable material can be broken down by naturally occurring microorganisms, such as bacteria and fungi, into simpler substances. Depending on the material and its surroundings, the resulting substances may include water, carbon dioxide, methane, mineral compounds, and biomass. The definition describes what can happen, but it does not automatically explain where, when, or how completely it will happen.
Conditions have a direct effect on biodegradation. Temperature, moisture, oxygen, microbial activity, material thickness, and chemical composition all influence the process. A product that biodegrades in a warm industrial system may remain largely unchanged in dry soil or a low-oxygen landfill. This is why a biodegradable claim without a test method, time frame, and disposal environment gives you limited information.
Conventional plastics also become smaller over time, but fragmentation is not the same as complete biodegradation. Sunlight, heat, and mechanical wear may break plastic into small pieces while leaving the polymer in the environment. Those particles may become microplastics rather than returning safely to natural biological cycles.
Does Biodegradable Mean It Will Break Down Quickly?
No. The word biodegradable does not, by itself, establish a reliable breakdown period. Depending on the product, the process may take weeks, years, or considerably longer. It may also require conditions that are not available after normal disposal.
For example, a paper item with a conventional plastic lining contains components that behave differently. The paper may break down relatively quickly under moist, biologically active conditions, while the plastic layer remains or fragments into smaller pieces. Describing the entire item as biodegradable can therefore create the wrong expectation unless the complete product has been tested.
When assessing biodegradable trash bags or packaging, look beyond the front label. Check whether the manufacturer identifies the test standard, test environment, expected time frame, and certification body. If those details are missing, you cannot assume the product is suitable for composting.
What Compostable Means
Compostable packaging is designed to break down into usable compost or other non-toxic natural outputs under defined composting conditions. A certified compostable product must meet requirements for disintegration, biodegradation, chemical safety, and the quality of the resulting compost. The exact testing requirements depend on the applicable standard and certification program.
Most commercial compostable packaging is intended for industrial or commercial composting facilities. These facilities control temperature, moisture, oxygen, and processing time. A product that passes an industrial compostability standard may not break down in a household compost pile, where temperatures and microbial conditions are less consistent.
Industrial Compostable vs. Home Compostable
Industrial composting facilities typically use higher and more consistent temperatures. They can process food scraps, yard waste, certified compostable packaging, and other approved materials at a controlled scale. Home composting takes place at lower and more variable temperatures, so a product certified for home composting must be tested for that specific environment.
| Packaging Claim | Typical Environment | What You Should Confirm |
|---|---|---|
| Industrially compostable | Commercial composting facility | Whether a local facility accepts the product |
| Home compostable | Backyard or household composting | The certification and expected breakdown conditions |
| Biodegradable | Conditions vary | Time frame, residues, and complete-product testing |
| Recyclable | Designated recycling system | Whether local recyclers accept the material and format |
| Marine degradable | Controlled marine testing | Certification scope and disposal guidance |
What Is The Difference Between Compostable And Biodegradable?
The main difference between compostable and biodegradable packaging is the level of definition. Biodegradable describes a biological breakdown process, but it may not specify the time, conditions, or final result. Compostable describes a product that has been tested against defined requirements for breakdown and compost safety.
In simple terms, compostability is a more specific claim. A compostable packaging bag should break down within the time period established by the applicable standard and should not create harmful residues in the finished compost. A biodegradable bag may break down eventually, but the claim alone does not tell you whether it will do so within a useful time frame or in your intended disposal system.
Compostable vs. Biodegradable Packaging Bags
When you compare compostable packaging bags with biodegradable packaging bags, examine the entire product rather than the material name alone. A bag may use a biodegradable resin but still include non-compostable components. A compostable bag may be suitable for food waste collection, produce packaging, or selected retail applications, but its performance depends on thickness, sealing, moisture exposure, and product requirements.
For example, a certified compostable bag used to collect food scraps can enter a commercial composting stream where the local operator accepts it. A biodegradable mailer may be better suited to a different disposal or recovery system, depending on its certification and construction. The correct option depends on the application and the available end-of-life route.
| Feature | Biodegradable Packaging | Compostable Packaging |
|---|---|---|
| Definition | Can be broken down by biological activity | Breaks down under specified composting conditions |
| Time frame | May be undefined | Defined by the relevant standard |
| Final output | May vary | Must meet requirements for compost safety |
| Certification | Not always required or available | Commonly supported by recognized certifications |
| Disposal route | Depends on the product | Usually industrial composting unless home-certified |
| Environmental claim | Broad and potentially unclear | More specific and test-based |
How Do Compostable Products Compare To Alternatives?
Compostable products are useful when they help divert food scraps and other organic material into a compatible composting system. They are not automatically the lowest-impact choice for every application. Reusable products, recyclable materials, conventional plastic, paper, and compostable materials each perform differently depending on use and local infrastructure.
A reusable container or washable bin liner may have the lowest waste impact when repeated use is practical. Recyclable packaging may be appropriate when it is clean, properly sorted, and accepted by local collection programs. Compostable packaging is often more relevant when food contamination makes recycling difficult or when the item is used to collect organic waste.
| Product Option | Best-Fit Scenario | Main Limitation |
|---|---|---|
| Reusable product | Repeated use with an effective washing system | Requires collection, cleaning, and user participation |
| Recyclable plastic | Clean material accepted by local recycling programs | Food contamination and flexible films can limit recycling |
| Paper product | Dry or lightly soiled uses with appropriate recovery options | Coatings may affect recyclability or compostability |
| Certified compostable product | Food waste collection and foodservice systems with compost access | Requires acceptance by a suitable composting facility |
| Conventional plastic | Applications requiring high strength or barrier performance | Usually fossil-based and may persist if not recovered |
Alternative Eco-Friendly Definitions
Environmental topics are often printed close together on packaging, but they do not describe the same outcome. You should evaluate each claim according to its test method, disposal environment, and supporting certification.
Zero Waste
Zero Waste is a broader resource-management objective rather than a material certification. The Zero Waste International Alliance describes it as the conservation of resources through responsible production, consumption, reuse, and recovery without harmful discharges to land, water, or air.
A compostable product may support a Zero Waste program when it helps recover food scraps and other organic materials. However, a disposable product does not become Zero Waste solely because it is compostable. Waste prevention and reuse generally come before recycling and composting in a resource hierarchy.
Degradable
Degradable means that a material can change or break down through chemical, physical, or biological processes. The topic does not establish complete biodegradation, a safe end product, or a practical time frame.
Most materials are technically degradable under some conditions. For that reason, a standalone degradable claim has limited value when you are evaluating trash bags or food packaging. Look for a defined standard and a clearly stated disposal route.
Marine Biodegradable
Marine biodegradability refers to breakdown under specified marine testing conditions. Standards and certification schemes may evaluate biodegradation, disintegration, and environmental toxicity in marine environments.
This designation is not permission to dispose of a product in the ocean. Marine litter can travel, harm wildlife, and remain in environments that differ from laboratory test conditions. All bags and packaging should still be collected and managed through an appropriate waste system.
Oxo-Degradable
Oxo-degradable plastic is conventional plastic containing additives intended to accelerate fragmentation when exposed to heat, oxygen, or light. The process can create smaller plastic fragments without demonstrating complete biological conversion into natural substances.
Oxo-degradable plastics should not be confused with certified compostable plastics. The European Union restricts oxo-degradable plastic products because of concerns about microplastic formation, environmental claims, and interference with recycling systems.
How To Look Out For Greenwashing
Greenwashing occurs when packaging uses environmental language that creates a stronger impression than the available evidence supports. “Eco-friendly,” “green,” “natural,” “degradable,” and “biodegradable” can be misleading when they appear without a time frame, test method, certification, or disposal instruction.
Common Greenwashing Warning Signs
- Uses “biodegradable” without stating a breakdown period
- Claims to disappear in nature without identifying test conditions
- Displays a leaf, green color, or environmental symbol without certification
- Calls itself compostable but does not specify industrial or home composting
- Uses a certification logo that cannot be verified
- Describes an additive as proof that the complete bag is biodegradable
- Suggests that the package can be thrown into any compost bin
- Claims to be plastic-free while using a plastic-based compostable polymer
- Provides no disposal guidance for customers
Regulatory and Certification Evidence
In the United States, environmental marketing claims are subject to Federal Trade Commission guidance. Unqualified degradable claims can be problematic when a product enters the solid waste stream and does not fully break down within a reasonable period under customary disposal conditions. Compostable claims also require reliable evidence that the product becomes usable compost in an appropriate facility.
- The full product specification
- The applicable ASTM, EN, or other recognized standard
- The certification number or verification record
- Testing information for the complete product
- Recommended disposal conditions
- Confirmation about inks, coatings, adhesives, and closures
- Any restrictions related to food contact or product use
How To Choose The Best Compostable Products
The best compostable product is the one that performs reliably in its intended application and has a realistic end-of-life route. Before ordering compostable packaging bags, define the product requirements first. Consider the bag size, load weight, seal type, film thickness, moisture exposure, odor control, transparency, printing, and storage conditions.
If the bag will be used for food-waste collection, confirm that the local commercial composting facility accepts that type of packaging. If customers will compost the bag at home, look for a home composting certification rather than relying on a general biodegradable claim.
Compostable Packaging Certifications
The following standards and certification programs are commonly referenced when evaluating compostable packaging. The exact requirements and acceptance rules may vary by market and product type.
| Standard or Certification | What It Generally Indicates |
|---|---|
| BPI Certification | Independent verification for compostable products in North America against applicable ASTM requirements |
| CMA Field Testing | Additional field-oriented evaluation associated with compostability in commercial facilities |
| ASTM D6400 | Requirements commonly used for compostable plastics intended for municipal or industrial composting |
| ASTM D6868 | Requirements for paper or other products with biodegradable plastic coatings or films |
| EN 13432 | European requirements for packaging recoverable through industrial composting and biodegradation |
BPI Certification
The Biodegradable Products Institute, commonly known as BPI, provides certification for commercial compostable products in North America. Its certification process is based on recognized testing requirements and evaluates whether a product is suitable for processing in commercial composting systems.
When reviewing BPI documentation, check the listed product name and configuration. A certification for one bag thickness or printed version may not automatically cover another version. You should also confirm whether the destination composting facility accepts BPI-certified packaging.
Compost Manufacturing Alliance
The Compost Manufacturing Alliance, or CMA, has supported field testing of compostable products in real commercial composting operations. Field testing can provide useful information about how packaging behaves alongside food scraps, yard waste, and other organic materials.
Commercial acceptance still depends on the local composting operator. A product may pass a relevant test but remain unsuitable for a facility that does not have the equipment, processing time, or policy required to handle compostable plastic bags.
ASTM Standard D6400
ASTM D6400 is widely used for compostable plastics intended for industrial or municipal composting facilities. Testing addresses biodegradation, disintegration, and the impact of the material on compost quality under defined conditions.
Meeting ASTM D6400 does not mean that a bag will break down in a landfill, in seawater, or in every backyard compost pile. The claim should be communicated with the correct disposal context: industrially compostable, commercially compostable, or another precise term supported by the documentation.
ASTM Standard D6868
ASTM D6868 is commonly used for paper products and other items that include a biodegradable plastic film or coating. This is relevant to coated paper packaging, lined food-service products, and composite packaging structures.
The standard is especially important when a product appears to be paper but includes a polymer layer. You should evaluate the entire package, because the coating, adhesive, printing, and paper substrate must work together within the required composting process.
Conclusion
The difference between compostable and biodegradable comes down to conditions, time, and evidence. Biodegradable materials can be broken down by microorganisms, but the claim may not explain how long the process takes or where it will occur. Certified compostable products must meet defined requirements in an identified composting environment.
When choosing compostable trash bags, match the bag to the collection program first, then verify certification and product performance. Mille Container manufactures trash bags for commercial, retail, and waste-management applications. Contact Mille Container to discuss compostable trash bag specifications, certification requirements, custom sizes, printing, packaging, and order volumes for your market.
Faq
Is compostable better than biodegradable?
Compostable is a more specific and verifiable claim when it is supported by recognized certification. Whether it is the better choice depends on access to an accepting composting facility and the product’s intended use.
Does biodegradable mean compostable?
No. A biodegradable product may break down biologically without meeting the time frame, disintegration, or compost-quality requirements for certified compostable products.
How long do compostable bags take to decompose?
The time depends on the certification, material, bag thickness, and composting conditions. Certified industrial compostable bags are tested within the time limits established by the applicable standard. They may take much longer in a home compost pile or landfill.
Can compostable bags go in a home compost bin?
Only bags certified for home composting should be considered, and local guidance still applies. Industrial compostable bags may require temperatures that a home compost pile does not consistently reach.
Can compostable bags go in the recycling bin?
No. Compostable plastic should generally not be placed in conventional plastic recycling because it can contaminate the recycling stream. Follow local collection instructions.
Can biodegradable bags go in a compost bin?
Not unless they are specifically certified and accepted as compostable. A biodegradable label alone does not show that the bag will meet composting requirements.
Do compostable bags break down in landfills?
Not reliably. Landfills do not provide the controlled oxygen, moisture, temperature, and microbial activity used in composting facilities.
Do compostable bags leave microplastics?
Certified compostable products are tested for biodegradation and disintegration under their specified composting conditions. Conventional or uncertified products that only fragment may leave persistent plastic particles.
Are compostable bags made from plants?
Many contain renewable materials such as starch or plant-derived polymers, but some compostable polymers may include fossil-derived components. Compostability describes end-of-life performance, not necessarily the source of every ingredient.
What is the difference between industrial compostable and home compostable?
Industrial compostable products require the managed conditions of commercial composting facilities. Home compostable products are tested for breakdown at the lower temperatures typically found in home composting systems.
Are compostable trash bags suitable for regular household waste?
They can hold household waste, but their main environmental benefit comes from collecting accepted organic material for composting. If the bag goes to landfill, it may not break down as intended.
What certification should compostable trash bags have?
In the United States, look for certification based on ASTM D6400 from a recognized organization such as BPI. In Europe, EN 13432 certification is commonly used. Home compostable products require a separate home composting certification.
Can you put hot food in a compostable bag?
Allow very hot food and liquids to cool before placing them in the bag. Heat can weaken some compostable materials, and liquids increase the load on the bottom seal.
How should compostable trash bags be stored?
Keep them in their original packaging in a cool, dry place away from direct sunlight, high humidity, and heat. Follow the manufacturer’s shelf-life and storage instructions.
Why do composting facilities reject some certified compostable products?
Facilities use different processing technologies and operating schedules. Some cannot distinguish compostable products from conventional plastic, while others may not provide enough processing time for certain items. Certification does not override a facility’s acceptance policy.
