How to Identify Truly Compostable Bags?
With confusing claims and greenwashing rampant, how can consumers identify genuinely compostable bags? Look for these key indicators of quality:.
1. Trusted Certifications
One of the most reliable ways to verify compostability is through independent certifications. Reputable products will display labels from recognized certification bodies :
- BPI (Biodegradable Products Institute): The leading certification in North America, indicating compliance with ASTM D6400 standards for industrial composting .
- OK compost INDUSTRIAL (EN 13432): European standard for industrial composting facilities .
- OK compost HOME:Certification for bags that will break down in home composting systems .
- AS 5810: Australian standard for home compostable products .
These certifications ensure the bags have been rigorously tested and will break down completely within a specific timeframe without leaving toxic residues.
2. Material Transparency
OHigh-quality compostable bags will clearly state their material composition on the packaging. Look for specific information about the plant-based materials used, such as "PLA + PBAT + cornstarch" rather than vague terms like "bioplastic" . Reputable manufacturers are transparent about their materials and manufacturing processes.
3. Performance and Durability
A common concern about compostable bags is whether they're strong enough for practical use. Quality compostable bags should be strong and durable enough to hold typical organic waste without tearing or leaking . Features to look for include:
- Adequate thickness (measured in mil or microns)
- Leak-proof seals
- Puncture resistance
- Reinforced bottoms (such as star-sealed bottoms for heavy loads)
Performance tests have shown that well-made compostable bags can effectively handle everything from food scraps to yard waste .