Same Shelf, Very Different Stories
Walk into any wholesale packaging supplier and you'll find kraft paper bags and compostable bags sitting side by side, often at similar price points. They both look the part — brown, earthy, unmistakably "green". But for a café owner, market vendor, or takeaway operator trying to make a smart purchasing decision, the differences between them are significant enough to affect your costs, your customer experience, and whether your packaging actually does what you think it does at end of life.
This guide breaks down exactly how these two bag types compare across materials, performance, disposal pathways, regulatory context, and total cost of ownership. By the end, you should know clearly which one belongs in your operation — or whether you need both.
What Each Bag Is Actually Made From
Kraft paper bags are made from wood pulp processed via the kraft (sulphate) chemical process, which preserves long cellulose fibres and produces a paper that's notably strong for its weight. Standard kraft bags used in food service are typically unbleached, giving them that familiar brown colour. They're recyclable via the kerbside paper stream in most Australian councils, and they biodegrade naturally in soil or compost — although most end up in the recycling bin rather than a compost pile.
Compostable bags are a broader category. Most are made from one of three base materials: PLA (polylactic acid, derived from corn or sugarcane starch), PBAT (a petroleum-derived but compostable polymer), or a blend of both. Some newer formulations use certified compostable paper with a bio-based lining. The key distinction is that compostable bags are engineered to break down completely — leaving no toxic residue — in a certified composting environment, typically within 90 to 180 days under industrial conditions, or longer in home compost settings.
It's worth noting that "compostable" is a regulated claim in Australia. Legitimate compostable products should carry certification to AS 4736 (industrial compostable) or AS 5810 (home compostable), issued by bodies such as the Australasian Bioplastics Association (ABA). Without one of these marks, a product calling itself "compostable" is making an unverified claim.
Performance: Where Each Bag Excels (and Falls Short)
Kraft paper bags are workhorses. A standard flat-bottom kraft bag — say, 120mm × 75mm × 235mm, the typical small takeaway size — handles dry goods, baked goods, and light food items without issue. Heavier SOS (Self-Opening Satchel) kraft bags with a gusset base handle heavier loads reliably. The limitation is moisture: uncoated kraft paper will soften and eventually fail when exposed to wet or greasy foods. Some kraft bags come with a PE lining to address this, but that lining compromises recyclability — a detail worth knowing before you buy.
Compostable bags made from PLA or PBAT blends are typically more moisture-resistant by nature, making them better suited for damp applications: think produce bags, food waste liners, or carrying containers with some condensation on the outside. However, PLA-based bags have a well-documented weakness — they can become brittle in cold storage and will begin to break down if stored in hot, humid conditions for too long. Shelf life for PLA products is generally 12–18 months when stored correctly below 25°C, away from direct sunlight.
For raw load-bearing strength, a well-made kraft SOS bag (typically 70–90 gsm paper weight) will outperform a standard compostable bag of equivalent size. If you're bagging heavy grocery items or dense takeaway meals, kraft paper is the more reliable choice.
Disposal Pathways: The Detail That Actually Matters
This is where the comparison gets genuinely complicated — and where many businesses make assumptions that don't hold up.
Kraft paper bags without any lining can go straight into the kerbside recycling bin across most Australian councils. They can also be composted at home or in a commercial compost facility. That dual end-of-life pathway is a genuine advantage, especially for businesses whose customers are unlikely to have access to a commercial compost facility.
Compostable bags certified to AS 4736 are designed for industrial composting — the kind that reaches sustained temperatures of 55–60°C over several weeks. These bags will not break down adequately in a backyard compost bin, and they absolutely should not go into the kerbside recycling stream, where they contaminate the paper and cardboard bale. In most Australian cities, unless your business has a commercial food waste collection service (such as those offered by Yarra Valley Organic Compost in Victoria, or commercial FOGO programs in various NSW councils), a compostable bag may simply end up in landfill — where, without oxygen and heat, it behaves much like conventional plastic.
Home compostable bags (AS 5810 certified) offer a more practical end-of-life for consumer-facing applications, since customers can genuinely compost them at home. These tend to be thinner and less robust than industrial-grade compostable bags.
The practical upshot: if your customers don't have access to a commercial composting facility, a plain kraft paper bag — recyclable via kerbside — may actually have a better real-world environmental outcome than a certified compostable bag that ends up in landfill.
Regulatory Context: What Australian Businesses Need to Know in 2025
Australia's state-by-state single-use plastics legislation has been accelerating since 2021, and it directly affects which bags you can legally use. New South Wales banned lightweight plastic bags (under 35 microns) back in June 2022. Victoria's single-use plastics ban, which came into full effect in February 2023, covers a broad range of items. South Australia has had its plastic bag ban in place since 2009 — the first state to do so — and has been progressively tightening its rules on related packaging items.
Neither kraft paper bags nor certified compostable bags are caught by these bans — both are compliant replacements for lightweight plastic carry bags. However, the regulatory trend is moving toward requiring compostable or recyclable certification for any packaging claim, not just bags. The Australian Packaging Covenant Organisation (APCO) has set a 2025 target for 100% of packaging to be reusable, recyclable, or compostable, which is influencing purchasing decisions across the supply chain.
For food businesses specifically, it's worth keeping an eye on the ACCC's ongoing scrutiny of greenwashing claims. Using the word "compostable" on packaging or in marketing without valid AS 4736 or AS 5810 certification is increasingly risky territory from a compliance perspective.
You can explore our full range of compostable bags & pouches — all stocked with certification details so you know exactly what you're buying.
Cost Comparison: Wholesale Pricing in the Australian Market
At wholesale volumes, kraft paper bags are generally the more affordable option. A standard small kraft SOS bag (e.g., 90 × 55 × 175mm) typically retails in Australia at around $0.08–$0.15 per unit at carton quantities of 500–1,000 pieces. Larger bags with gusset bases run higher, but the per-unit cost remains accessible even for small operators.
Compostable bags command a premium, largely due to the cost of certified bio-based materials and the certification process itself. Expect to pay roughly 20–50% more per unit than an equivalent kraft bag at similar quantities. That gap narrows at higher volumes — ordering 5,000+ units rather than 500 makes a meaningful difference to the per-unit price.
The honest calculation for most businesses: if you're using bags purely for dry takeaway items and your customers will recycle them, kraft paper bags deliver excellent environmental credentials at a lower price point. If you're bagging food waste, wet produce, or operating in a venue with genuine commercial composting access, compostable bags earn their price premium.
Frequently Asked Questions
Can I use kraft paper bags for hot food?
Yes, with caveats. Unlined kraft paper bags can handle light heat from baked goods or wrapped items without issue. They are not suitable for direct contact with soups, saucy dishes, or anything with significant moisture content without a grease-resistant liner. Look for kraft bags with a food-safe interior coating if you're handling greasy or moist foods.
Are compostable bags better for the environment than kraft paper bags?
Not automatically. Compostable bags only deliver their environmental benefit if they're correctly disposed of in a commercial composting facility. If they go to landfill — which is the reality for most consumer waste in Australia — their benefit is limited. Kraft paper bags, which can be recycled via standard kerbside collection, often have a more reliable end-of-life outcome for the average customer. The best choice depends on your specific disposal infrastructure.
What certifications should I look for when buying compostable bags in Australia?
Look for AS 4736 certification for industrial compostable products, or AS 5810 for home compostable products. Both standards are administered through the Australasian Bioplastics Association (ABA). The certification mark should be visible on the product or its packaging. If a supplier cannot provide certification documentation, treat any compostability claim with scepticism.
Can I mix kraft paper bags and compostable bags in my business?
Absolutely — and many operators do. A common approach is using kraft paper bags for standard dry takeaway and retail applications, while using certified compostable bags for food waste collection or wet produce. Using the right bag for the right job is smarter than a blanket swap to one type across all applications.
Making the Right Call for Your Business
There's no universal winner in the kraft paper vs compostable bag debate. Kraft paper bags are versatile, cost-effective, genuinely recyclable, and right for the majority of dry food and retail applications. Compostable bags shine in specific use cases — food waste collection, farmers markets, venues with FOGO bin access — where their end-of-life pathway is actually viable.
What matters most is being honest about how your packaging will actually be disposed of, not just how it theoretically could be. A kraft bag that goes into the recycling bin is doing real environmental work. A compostable bag that ends up in landfill is largely a marketing exercise.
ZenPacks supplies both options to Australian businesses at competitive wholesale pricing, with stock held in Sydney for fast dispatch. Whether you're sourcing a few hundred bags to trial or locking in a carton order for the month, browse our compostable bags & pouches collection to compare certified options side by side — or get in touch with the team directly for bulk pricing on kraft paper bags at the quantities that suit your operation.
