"Biodegradable" and "compostable" are two of the most misused terms in pet product packaging. As a B2B buyer, choosing the wrong material means either overpaying for features your market does not need, or making a green claim your product cannot legally support.
This guide breaks down the real differences between the two, what certifications matter, and which one your brand should actually source.
The short answer
Biodegradable means the material will break down over time in the environment. Compostable means it will break down in industrial composting conditions within a defined timeframe (typically 180 days) and leave no toxic residue. All compostable bags are biodegradable, but not all biodegradable bags are compostable.
Material comparison
| Biodegradable (PLA+PBAT) | Compostable (OK compost) | Traditional plastic (PE) | |
|---|---|---|---|
| Material | Plant-based PLA + PBAT blend | Certified PLA+PBAT blend | Virgin polyethylene |
| Breakdown time | 6–24 months in soil | 180 days in industrial compost | 200+ years |
| Certification | Often self-claimed | OK compost HOME / EN13432 / ASTM D6400 | None needed |
| Cost (per roll) | ~20–40% premium over PE | ~40–70% premium over PE | Baseline |
| Best for | Mass-market eco lines | Premium / EU retail / certified green brands |
What to actually look for on a spec sheet
If you are buying biodegradable bags
- Material composition: PLA (corn-based) + PBAT (bio-based flexible polymer). Not oxo-degradable PE (which is just plastic with additives).
- Thickness: 18–25 μm for standard, 25–30 μm for heavy-duty. Thinner = cheaper but tears easier.
- Roll size: Standard is 15 bags/roll × 8 rolls/box. Confirm bag dimensions before ordering.
- Printing: Water-based soy inks only, if you want it to remain eco-credible.
If you are buying compostable bags
- Certificate number: Ask for the actual OK compost certificate (TÜV Austria) or EN13432 test report. A logo on the bag is not enough.
- Industrial vs home compost: "OK compost INDUSTRIAL" requires high-temperature facilities. "OK compost HOME" breaks down in home compost piles — a stronger claim but more expensive.
- EU market compliance: If selling to the EU, EN13432 is mandatory for any "compostable" claim.
The most common sourcing mistake: paying compostable prices for a product that only has biodegradable material with no third-party certification. Always ask for the certificate file, not just the printed logo.
Which should your brand choose?
The right choice depends on your market and price positioning:
- North America mass market: Biodegradable PLA+PBAT bags are the sweet spot. Consumers understand "eco" and the 20–40% price premium is acceptable at retail.
- EU / UK retail: Go for EN13432-certified compostable. EU regulators are cracking down on unsubstantiated "biodegradable" claims, and retailers like Boots and Waitrose require certification on packaging.
- Premium eco brands: Home compost-certified bags (OK compost HOME) justify the highest retail price point and strongest marketing story.
- Value / private label for Amazon: Biodegradable without the premium certification — cost-sensitive shoppers compare on price more than certification.
MOQ and pricing reality
From a Chinese factory (where most of these bags are made), realistic order terms are:
- Biodegradable bags: MOQ 500,000 rolls, FOB unit cost roughly $0.18–0.35 per roll depending on thickness and printing.
- Certified compostable bags: MOQ 200,000 rolls, FOB unit cost roughly $0.30–0.55 per roll, plus certificate setup cost for custom branding.
These are indicative ranges — exact pricing depends on bag size, thickness, printing colors, and whether you are doing custom private-label packaging or plain.
Bottom line
Biodegradable and compostable are not interchangeable marketing terms. Pick the material that matches your retail market, always demand third-party certification, and use the correct claim on your packaging. A good supplier will provide both the material test report and the certification document before you place a sample order.
PetNourish supplies both biodegradable (PLA+PBAT) and certified compostable dog poop bags with private-label branding. View our poop bags range or request samples.