Biodegradable packaging is any packaging material designed to be broken down by naturally occurring microorganisms, such as bacteria, fungi, and algae, into water, carbon dioxide, and organic biomass. Unlike conventional petroleum-based plastics, which can persist in the environment for hundreds of years, biodegradable options are engineered to decompose within months under the right conditions. The global biodegradable packaging market is valued at roughly $527 billion in 2025 and is projected to nearly double by 2035.
How Biodegradation Actually Works
The process starts when microorganisms in soil, water, or compost come into contact with the packaging material. These organisms secrete enzymes that cleave the long molecular chains of the polymer into smaller fragments. The fragments are then absorbed and metabolized by the microorganisms, ultimately converting the material into carbon dioxide, water, and biomass. It’s essentially the same process that breaks down a fallen leaf or a banana peel, just applied to materials that have been manufactured to be susceptible to it.
For a material to meet international standards for biodegradability, approximately 90% of its carbon content must convert to carbon dioxide through this microbial activity. The rate of breakdown should be comparable to natural materials like leaves, grass, and food scraps, and the entire process must complete within 180 days under composting conditions.
Common Materials Used
Biodegradable packaging falls into several broad categories. Starch-based polymers, often derived from corn or potato starch, are among the most widely used. They’re commonly found in loose-fill packing peanuts, food containers, and bags. Polylactic acid (PLA), made by fermenting plant sugars from corn or sugarcane, is popular for clear cups, clamshell containers, and food wraps. It looks and feels remarkably similar to conventional plastic.
Polyhydroxyalkanoates (PHAs) are produced directly by bacteria and break down in a wider range of environments, including marine settings. Cellulose-based films, derived from wood pulp, are used for transparent packaging and coatings. Paper and cardboard, when not laminated with conventional plastic, are the simplest and most familiar forms of biodegradable packaging.
Each material has trade-offs in terms of moisture resistance, shelf life, and the conditions it needs to fully decompose. PLA, for instance, typically requires the high temperatures of an industrial composting facility and won’t break down meaningfully in a backyard compost bin or a landfill.
Biodegradable vs. Compostable
These two terms are often used interchangeably, but they mean different things. All compostable packaging is biodegradable, but not all biodegradable packaging is compostable. The distinction matters for how you dispose of it.
Biodegradable packaging may be engineered to break down in soil, water, or other natural environments, with no specific requirement about what it leaves behind. Compostable packaging has a stricter definition: it must decompose in a commercial composting facility within six months, at a rate similar to other compostable materials, and leave behind no toxic residue that would harm plant growth. The finished product is essentially indistinguishable from regular compost.
The U.S. Federal Trade Commission’s Green Guides add another layer. Calling a product “biodegradable” without qualification is considered deceptive if it won’t fully decompose within one year of customary disposal. Since most packaging ends up in landfills, where conditions don’t support rapid decomposition, many broad biodegradability claims on labels don’t hold up under scrutiny.
Certifications to Look For
Two major standards govern compostable packaging claims. In the European Union, EN 13432 applies specifically to packaging and requires at least 90% biodegradation within 180 days in an industrial composting facility, full disintegration, and proof that no toxic residues remain. Products meeting this standard can carry the “seedling” logo. In North America, ASTM D6400 sets nearly identical benchmarks: 90% biodegradation in 180 days, complete disintegration, and eco-safety testing. Certified products carry the BPI (Biodegradable Products Institute) logo.
Both standards test the final product, not just the raw material. A cup or bag must pass on its own merits, including any inks, coatings, or adhesives. If you see one of these logos on packaging, it means the product has been independently verified to break down fully in an industrial composting facility.
A separate symbol exists for home-compostable products, which break down at lower temperatures than industrial facilities provide. This distinction is worth checking, since most people don’t have access to commercial composting.
The Landfill Problem
Here’s the part that surprises most people: biodegradable packaging that ends up in a landfill can actually be worse for the climate than conventional plastic. Landfills are largely anaerobic environments, meaning they lack the oxygen that microorganisms need for clean decomposition. When biodegradable materials break down without oxygen, they produce methane, a greenhouse gas far more potent than carbon dioxide. Research from the Yale School of the Environment found that if biodegradable alternatives end up in landfills, it could double greenhouse gas emissions compared to conventional plastic.
This means the environmental benefit of biodegradable packaging depends almost entirely on what happens after you throw it away. Sent to an industrial composting facility or an anaerobic digestion plant (which captures methane for energy), these materials deliver on their promise. Tossed in a regular trash bin, they may perform worse than the plastic they replaced.
How to Dispose of It Correctly
The single most important thing to know is that biodegradable and compostable plastics should not go in your recycling bin. They can contaminate batches of conventional plastic recycling, since they look similar but have different chemical compositions. A single compostable cup mixed into a load of recyclable PET bottles can compromise the entire batch.
Your best options depend on what’s available where you live. If your municipality offers curbside compost collection or has a drop-off site for organic waste, compostable packaging (look for the seedling or BPI logo) typically goes in that bin. Some communities explicitly accept certified compostable packaging; others accept only food scraps and yard waste. Check your local program’s guidelines, because they vary widely.
If you don’t have access to industrial composting, home-compostable items can go in a backyard compost pile, though they’ll take longer to break down than food scraps. Items certified only for industrial composting won’t decompose properly in a home setup. And if none of these options are available, biodegradable packaging unfortunately ends up in the trash, where it loses most of its environmental advantage.
Why Disposal Infrastructure Matters
The biodegradable packaging industry is growing at nearly 6% annually, but composting infrastructure hasn’t kept pace. In the United States, only a fraction of communities have access to industrial composting facilities that accept packaging. The result is a gap between what the packaging is designed to do and what actually happens to it in practice. Many people buy biodegradable products believing they’re making a greener choice, only for those products to end up in a landfill producing methane.
This doesn’t mean biodegradable packaging is pointless. In closed systems like stadiums, festivals, corporate campuses, and airline catering where all waste is collected and routed to composting, it works exactly as intended. The challenge is scaling that infrastructure to match the growing volume of biodegradable products on store shelves. Until then, the most effective step you can take is confirming that your local waste system can actually process the biodegradable packaging you buy.