Biodegradable Compostable Bags: The Complete 2026 Guide to Certified Plastic-Free Packaging

What Are Biodegradable Compostable Bags?

Biodegradable compostable bags are packaging bags made from plant-derived resins — typically PBAT, PLA and corn starch blends — that microorganisms break down into water, carbon dioxide and biomass under composting conditions. Unlike conventional plastic bags, biodegradable compostable bags leave no microplastics behind. The defining trait of biodegradable compostable bags is that they are certified to fully biodegrade within a defined timeframe, usually 180 days in industrial compost or 12 months in home compost.

For brands and distributors, biodegradable compostable bags are not a marketing label but a regulated, certified product category. A bag can only be sold as biodegradable compostable bags when it carries an accredited certificate such as EN 13432, ASTM D6400, OK Compost INDUSTRIAL, OK Compost HOME or BPI. Techuang manufactures biodegradable compostable bags under all of these certification scopes from its Henan factory.

Biodegradable vs Compostable vs Oxo-degradable Bags

The terms are often confused, but the difference matters for compliance. Biodegradable compostable bags are certified to convert entirely to biomass, water and CO₂ in a composting environment. "Biodegradable" alone only means the material will eventually break down, with no time limit and no guarantee of no toxic residue. Oxo-degradable bags are conventional plastic with additives that fragment into microplastics — these are banned in the EU and are not biodegradable compostable bags.

Only biodegradable compostable bags carrying EN 13432 or ASTM D6400 certification are accepted by municipal composting facilities. Choosing certified biodegradable compostable bags protects brands from greenwashing claims and ensures genuine end-of-life performance.

Key Certifications for Biodegradable Compostable Bags

Certification is the single most important factor when sourcing biodegradable compostable bags. The five internationally recognised standards are: EN 13432 (European industrial compostability), ASTM D6400 (US compostability), OK Compost INDUSTRIAL (TÜV Austria, industrial), OK Compost HOME (TÜV Austria, home compost) and BPI (North America). Biodegradable compostable bags must pass biodegradation, disintegration and ecotoxicity tests under each scope.

Techuang biodegradable compostable bags hold OK Compost HOME certificate TA8022307547, OK Compost INDUSTRIAL certificate TA8012106042, BPI certificate 10529372-2, and full EN 13432 / ASTM D6400 compliance. This means our biodegradable compostable bags are accepted across EU, US, UK and Australasian municipal compost programs.

Materials Behind Biodegradable Compostable Bags

Most certified biodegradable compostable bags are made from a PBAT + PLA + corn starch blend. PBAT (polybutylene adipate terephthalate) provides flexibility and tear strength; PLA (polylactic acid) derived from corn adds rigidity; corn starch improves biodegradation speed. Together they produce biodegradable compostable bags that match the strength of conventional plastic while remaining fully compostable.

Techuang compounds its own resin in-house, which is why our biodegradable compostable bags keep their certificate scope intact from raw resin to printed finished bag — including the printing inks, which are certified within the same compostable scope as the bag film.

Types of Biodegradable Compostable Bags

Biodegradable compostable bags cover the full range of everyday packaging: compostable shopping bags (T-shirt, patch-handle, loop-handle), compostable bin liners and kitchen caddy liners, compostable produce bags, compostable mailer bags for e-commerce, compostable pet waste bags, compostable bread bags and compostable zipper bags. Each type of biodegradable compostable bags is engineered for its use case while sharing the same certified compostable end-of-life.

For supermarkets, biodegradable compostable bags replace HDPE checkout carriers. For households, biodegradable compostable bags replace PE bin liners in food-waste collection. For e-commerce brands, biodegradable compostable bags replace poly mailers. Across every category, biodegradable compostable bags deliver the same function with a circular end-of-life.

Benefits of Switching to Biodegradable Compostable Bags

Switching to biodegradable compostable bags delivers four measurable benefits. First, biodegradable compostable bags eliminate microplastic pollution — they return fully to soil. Second, biodegradable compostable bags meet EU PPWR and single-use plastics legislation, keeping brands compliant. Third, biodegradable compostable bags carry credible certification marks that resist greenwashing challenges. Fourth, biodegradable compostable bags run on existing bag-making and printing equipment, so the switch needs no new machinery.

For B2B buyers, biodegradable compostable bags also de-risk tender requirements — municipal and retail tenders increasingly mandate EN 13432 or BPI certified biodegradable compostable bags.

How to Choose Biodegradable Compostable Bags

When sourcing biodegradable compostable bags, verify four things: (1) a valid certificate number with scope covering printed and coloured variants; (2) the correct composting scope for your market — HOME for garden compost, INDUSTRIAL for municipal; (3) food-contact compliance under EU Regulation 10/2011 if used with food; (4) an in-house manufacturer that controls resin, film, printing and converting, so the certificate scope is uninterrupted. Techuang biodegradable compostable bags meet all four criteria.

Always request the signed PDF certificate scope, test report and declaration of conformity — not just a logo. Genuine biodegradable compostable bags come with full documentation.

Frequently Asked Questions About Biodegradable Compostable Bags

Conclusion: The Future Is Biodegradable Compostable Bags

Biodegradable compostable bags are no longer a niche — they are the regulated future of everyday packaging across Europe and North America. With EU PPWR tightening, single-use plastic bans expanding, and retailers mandating certified compostable packaging, biodegradable compostable bags are the lowest-risk, highest-credibility choice for brands and distributors.

Techuang manufactures the full range of certified biodegradable compostable bags — shopping bags, bin liners, produce bags, mailer bags, pet waste bags, bread bags and zipper bags — from its 400-mu Henan factory, with OK Compost HOME, OK Compost INDUSTRIAL, BPI, EN 13432 and ASTM D6400 certification. Request samples or a factory-direct quote and our team replies within 24 hours.