Quick Answer
Biodegradable waste bags are marketed as capable of breaking down through biological activity, but the label alone may not specify a verified timeframe, test method, or disposal environment. When choosing waste bags, key factors include the type of waste (kitchen, general, or yard), bag size, thickness, seal strength, and any applicable certifications.
What Are Biodegradable Waste Bags?
Biodegradable waste bags are bags designed for collecting and disposing of waste, with the claim that they will break down over time through the action of microorganisms. Unlike certified compostable bags, which must meet specific standards such as ASTM D6400 or EN 13432 and break down within a defined timeframe, biodegradable bags may not have a guaranteed breakdown timeframe or a specific disposal environment.
The term “biodegradable” can be applied to a wide range of materials—from plant-based polymers to petroleum-based plastics with additives that cause fragmentation. This broad definition makes it essential for buyers to look beyond the label and verify actual performance claims. For a broader comparison of polyethylene bags, biodegradable plastics, recycling, and environmental impact, read our plastic bags guide.
Biodegradable vs Compostable vs Conventional Bags
Understanding the differences is critical for making the right choice:
| Feature | Biodegradable Bags | Compostable Bags | Conventional Plastic Bags |
|---|---|---|---|
| Definition | A claim that biological breakdown may occur; timeframe and conditions vary | Designed to meet defined compostability requirements under specified conditions | Conventional plastic products, commonly made from PE |
| Certification | Not necessarily certified | May be supported by a finished-product certification or applicable standard | Usually not compostability-certified |
| Breakdown Conditions | Vary by formulation and environment | Must be evaluated under the applicable certification conditions | Not designed for composting |
| Residue | Depends on formulation and test evidence | Must meet the applicable standard’s disintegration, biodegradation, and related requirements | Does not become compost under normal composting conditions |
| Disposal | Follow the product and local waste-program instructions | Use only the certified and accepted disposal route | General waste or approved recycling route, where applicable |
Key Insight: Compostable products are designed and evaluated to biodegrade and disintegrate under defined composting conditions, while the term biodegradable alone does not specify the same conditions or timeframe. Certification does not automatically mean that the bag is accepted by every composting facility or suitable for home composting. For certified compostable liners and composting conditions, read our compost bags buying guide.
Types and Uses of Biodegradable Waste Bags
Household General Waste (Biodegradable Dustbin Bags Liners)
Typical size: 10–30 litres
Recommended material: Biodegradable plastic blends (PBAT, PLA, starch blends) or paper-based options
Some biodegradable bin liners use PSM or other starch-based formulations. The finished product’s properties depend on the complete formulation and testing. Paper-based options are also available and may be accepted by some organic-waste collection programs when they are uncoated and free from unsuitable inks, adhesives, and other non-paper components. Always check local program rules.
Kitchen Organic Waste
Typical size: 10–12 litres
Recommended material: Certified compostable liners or unprinted kraft paper bags
Paper waste bags with reinforced bases may be suitable for GFT (organic food and garden waste) or organic-waste collection programs where accepted. However, paper bags have limited moisture resistance and are not suitable for wet food waste without liners. Check the local program before use.
Commercial and Office Waste
Typical size: 20–80 litres
Recommended material: Heavy-duty biodegradable plastic bags
Larger biodegradable waste bags (e.g., 20L, 50L, 80L) are available for commercial settings. Some are certified to EN 13432 and feature star-sealed bases that may improve load distribution and help reduce leakage or tearing when properly designed and tested. Proper storage is essential—compostable liners should be kept in a cool, dark, dry place and used within the manufacturer’s recommended timeframe.
Yard and Garden Waste
Typical size: 30–60+ gallons
Recommended material: Kraft paper bags or thick biodegradable film bags
Paper yard waste bags are commonly used for leaves, grass, and garden clippings. They are often accepted by municipal yard waste programs. Uncoated paper bags may be easier to manage in some home-composting systems than film-based alternatives, but acceptance depends on the paper, inks, adhesives, contamination, and local guidance.
For a broader comparison of materials, sizes, uses, and disposal options, read our biodegradable waste bags buying guide.
What Are Biodegradable Waste Bags Made Of?
| Material | Source | Properties | Disposal |
|---|---|---|---|
| PBAT | Fossil-fuel-based biodegradable polyester | Flexible, durable, tear-resistant | Depends on certification and facility |
| PLA | Corn, sugarcane, or other plant starches | Stiff, bio-based | Industrial composting (specific formulations) |
| PSM (Corn Starch) | Corn starch and renewable plant materials | Renewable content; properties depend on the complete formulation and finished-bag testing | Depends on formulation, certification, and receiving waste-management system |
| Starch Blends | Corn starch + PBAT/PLA | Renewable content, cost-effective | Varies by formulation and certification |
| Mineral Fillers (e.g., CaCO₃) | Natural minerals | May affect film stiffness, cost, processing, and finished-product performance. They do not make conventional PE bags biodegradable or compostable by themselves | Verify the complete formulation and finished-product documentation |
| Paper / Kraft | Recycled paper or wood pulp | Breathable, strong when dry | Home composting if uncoated and ink-free; check local guidance |
What “Biodegradable” Actually Means in Practice
In practice, the biodegradability of a bag depends heavily on the disposal environment.
A key distinction: Some oxo-degradable products may fragment rather than achieve the level of biodegradation expected from a compostable or fully biodegradable claim. Buyers should verify the product’s test evidence and applicable requirements.
What Size and Thickness Should You Choose?
Important: The capacity ranges below are practical starting points, not universal industry standards. Confirm the finished bag’s dimensions and usable capacity against the target bin and product specifications. There is no single universal size for biodegradable waste bags. The right size depends on bin dimensions, waste type, and handling requirements. Typical finished-bag dimensions vary by gusset, shape, and manufacturer.
| Size | Common Use | Typical Dimensions |
|---|---|---|
| 10 litres | Kitchen scraps, countertop bins | Varies by manufacturer |
| 20 litres | Small kitchen bins, office waste | Varies by manufacturer |
| 30–60 litres | Standard waste bins | Varies by manufacturer |
| 80 litres | Commercial dustbins, large bins | Varies by manufacturer |
How to Choose the Right Biodegradable Waste Bag Size
Selecting the correct size requires measuring your bin:
- Opening width: Measure straight across the top of the bin
- Bin height: Measure from the inside bottom to the top rim
- Overhang: Add 4–6 inches for securing the bag over the rim
- Volume: Choose a bag capacity that matches or slightly exceeds your bin’s capacity
Thickness Guide
| Thickness | Best For |
|---|---|
| 15–25 microns | Lightweight use, dry waste |
| 25–40 microns | Standard use, moderate food waste |
| 40–60+ microns | Heavy-duty use, wet waste, commercial |
Note: Strength comes from material formulation and seal design as much as thickness. A well-formulated 25-micron PBAT blend may outperform a 30-micron PLA bag.
Strength, Seal, and Leak Resistance
Real-world performance of biodegradable waste bags depends on more than just thickness. Key factors include:
- Material formulation: PBAT-containing blends may offer greater flexibility than PLA-dominant formulations, but finished-bag puncture resistance depends on the full formulation, thickness, geometry, seals, and testing.
- Seal design: Star-seal or gusseted bottoms provide better load distribution and reduce the risk of leakage.
- Bag geometry: Flat-bottom bags hold more than round-bottom bags of the same volume.
- Storage conditions: Heat and moisture can cause biodegradable bags to break down before use.
Storage and Use Guidelines
Follow the finished product’s storage and use instructions. Heat, moisture, sunlight, and prolonged storage may affect some biodegradable or compostable films, but the acceptable storage period depends on the formulation, packaging, and manufacturer’s specifications.
How to Dispose of Biodegradable Waste Bags
The disposal method affects the environmental benefit of biodegradable waste bags depending on certification and local facility acceptance:
| Disposal Method | Suitability / Conditions | Notes |
|---|---|---|
| Industrial composting | Suitable only when the finished bag is certified for industrial composting and the receiving facility accepts it | Requires finished-product certification or verification against applicable requirements; facility acceptance also applies |
| Home composting | Variable | Only home-compostable certified bags break down properly; many industrial-only bags will not fully break down |
| Landfill | Limited | Lack of oxygen slows decomposition; some bags remain intact for years |
| Marine environment | Not recommended | Cold water and low oxygen delay decomposition; marine disposal is not an appropriate disposal route for these products |
Important: Many curbside recycling programs do not accept biodegradable bags because they may contaminate recycling streams. Check with your local waste management authority for guidance on acceptable disposal methods. In North America, BPI certification is one verification option for eligible products. ASTM D6400 and EN 13432 are applicable standards, not universal disposal permissions.
What to Look for When Buying Biodegradable Waste Bags
Check the Claim
- “Biodegradable” alone — verify what “biodegradable” means for the specific product. It may simply mean “fragments into microplastics.”
- “Compostable” — look for finished-product certification or verification against applicable requirements, such as ASTM D6400 or EN 13432, depending on the target market and disposal system.
- “Oxo-degradable” — verify the product’s test evidence and applicable requirements; some oxo-degradable products may fragment rather than fully biodegrade.
Verify Certification Logo
To verify product suitability, look for:
- ASTM D6400 – US standard for applicable compostable plastics
- EN 13432 – European standard for compostable packaging
- BPI Certified – North American third-party certification program
- OK Compost HOME – Home composting certification system
- AS 4736 – Australian standard for compostable products
Match Size and Thickness to the Application
- Smaller bins: 10–20L bags
- Standard bins: 30–60L bags
- Commercial bins: 80L+ bags
- Heavy or wet waste: consider a thicker film and reinforced seals, then validate leak and load performance through finished-product testing
Test Strength and Leak Resistance
Before bulk ordering, request samples and test:
- Seal strength under load
- Puncture resistance with typical waste
- Leak resistance with wet waste
- Performance after storage (check manufacturer’s recommended shelf life)
Biodegradable Waste Bags Wholesale
For commercial buyers, specifying the right product requires clear communication:
| Specification | What to Provide |
|---|---|
| Size | Width × length or capacity in litres |
| Thickness | Microns |
| Material | PBAT / PLA / starch blend / paper |
| Bag style | Flat / gusseted / star-seal |
| Seal | Bottom / side |
| Roll | Bags per roll |
| Packaging | Retail / bulk |
| Certification | Required market (ASTM D6400, EN 13432, BPI) |
| Quantity | MOQ / annual volume |
For B2B buyers: Request finished product certification—not just raw material claims. A bag’s certification must cover the final product, including inks, adhesives, and closure systems.
FAQs
Are biodegradable waste bags really biodegradable?
Not always. Biodegradability depends on the specific material, formulation, and disposal environment. Some “biodegradable” bags simply fragment into microplastics rather than fully degrading. For a more reliable environmental benefit, look for certified compostable bags.
Can biodegradable waste bags go in the compost?
Only if the finished bag is certified or verified for the intended composting system. Examples include products certified against applicable ASTM D6400 or EN 13432 requirements, but local facility acceptance is still required. Most biodegradable bags without certification are not suitable for composting and may contaminate the process. Paper-based bags with no plastic coating may be suitable for home composting if accepted by your local program.
Are biodegradable waste bags stronger than regular plastic bags?
It depends on the formulation. High-quality biodegradable bags (e.g., PBAT-rich blends) can achieve good tensile strength, but conventional PE bags generally have better durability and moisture resistance. For heavy or wet waste, choose thicker bags with reinforced seals.
How long do biodegradable waste bags take to break down?
Breakdown time depends on the disposal environment:
Industrial composting: varies by product certification and facility conditions
Home composting: may take several months or longer under suitable conditions
Landfill: composting conditions are generally absent, so certified compostability should not be assumed
Marine environments: do not treat marine exposure as an appropriate disposal route; degradation conditions are unpredictable
What’s the difference between biodegradable and compostable waste bags?
Biodegradable bags break down via microorganisms, but the timeframe and completeness are not guaranteed. Compostable bags must meet applicable certification requirements for disintegration and biodegradation under defined composting conditions (e.g., ASTM D6400 or EN 13432). Compostable products are designed to biodegrade and disintegrate under defined composting conditions, while the term “biodegradable” alone does not specify the same conditions or timeframe.
Are biodegradable waste bags safe for food waste?
Yes, when manufactured from food-contact compliant materials. However, paper-based bags have limited moisture resistance and may not be suitable for wet food waste without liners. For food waste collection, certified compostable liners are generally recommended.
Can I put biodegradable waste bags in my recycling bin?
Many curbside recycling programs do not accept biodegradable bags because they may contaminate recycling streams. Check your local waste-management authority’s accepted-materials list.
Need Help Specifying Biodegradable Waste Bags?
Our team can assist with material recommendations, certification verification, size, thickness, packaging, MOQ, and printing requirements.
Contact HEMCbags for a Custom Quote
Written by: Chris, HEMCbags Packaging Team
Reviewed by: HEMCbags Product & Compliance Team with experience in biodegradable and compostable bag manufacturing, certification requirements, and international B2B supply.
