Bin liners are one of the most consistently over-paid-for items in NZ small business. They're also one of the most commonly bought wrong — too thin for the job, the wrong size for the bin, or premium quality where commodity works perfectly well.
Understanding two specs — gauge and capacity — means you buy the right product at the right price, every time.
Understanding Gauge (Thickness)
Gauge refers to the thickness of the bin liner film, measured in microns (µm). This is the single most important spec for commercial buyers. Getting it wrong in either direction costs you money.
- Too thin: Tears during use, splits when lifted, creates mess and requires double-bagging — false economy regardless of unit price.
- Too thick: You're paying for strength you don't need. Overkill for light waste like paper or packaging off-cuts.
A practical gauge guide for NZ businesses:
| Gauge | Application | Typical Use |
|---|---|---|
| 8–12 µm | Light duty | Office bins, reception, light paper waste |
| 15–20 µm | Medium duty | General kitchen bins, bathroom waste, retail floor bins |
| 25–35 µm | Heavy duty | Commercial kitchen bins, food waste, heavy or sharp materials |
| 40–60 µm | Extra heavy / wheelie bin liners | Outdoor wheelie bins, construction waste, bulk waste |
Many NZ businesses default to a single gauge across their operation. This is almost always either over-specced for some uses or under-specced for others. Splitting into two grades — medium for front-of-house and heavy for kitchen — typically reduces cost and improves reliability simultaneously.
Bin Sizes and Liner Capacity
A liner that's too small for the bin won't seat properly and will pull down under weight. A liner that's too large bunches up, creates gaps at the top, and wastes material.
Commercial bins in NZ are typically available in these standard sizes, with matching liner capacities:
- 15–20 litre — small desk or bathroom bin. Common in offices and hotel rooms.
- 30–40 litre — medium kitchen or waste station bin. Standard for cafes and retail.
- 60–80 litre — large kitchen bin. Standard for commercial kitchen environments.
- 120–140 litre — wheelie bin or high-volume kitchen. Requires heavy-duty gauge.
- 240 litre — standard NZ wheelie bin. Full wheelie bin liners.
Measure your actual bins rather than guessing. Width x depth x height gives you the capacity, but for the liner you want the circumference (2x width + 2x depth) and the depth, with a few extra centimetres for overhang at the top.
Colour and Identification
Clear bin liners are useful when you need to see contents without opening (recycling sorting, lost property, food prep waste checks). Black is standard for general waste and prevents contents being visible in customer-facing areas. Coloured liners (red, yellow, blue) are sometimes used in commercial kitchens for waste stream separation — matching your colour-coding system for cleaning cloths and equipment.
On-Roll vs Flat-Pack
On-roll bin liners (like a roll of glad bags) are fast to dispense, easy to store near the bin, and reduce the chance of staff taking more than one at a time. They're the standard in most commercial hospitality and retail environments.
Flat-pack liners (folded, in a box) are slightly lower cost per unit in bulk but require a separate storage solution and are slower to access in a busy kitchen. For back-of-house storage efficiency, on-roll typically wins.
Recycled vs Virgin Plastic
Bin liners made from recycled content (post-consumer recycled or PCR plastic) are increasingly available at competitive prices in NZ. For non-food-contact waste, there's no functional difference in performance at equivalent gauge. If environmental credentials matter to your business or customers, it's worth specifying.
Note: "biodegradable" bin liners in New Zealand typically require industrial composting conditions to break down. In a standard landfill environment, they don't degrade meaningfully faster than standard LDPE. The term is often misleading on packaging — check the specific degradation conditions if this matters for your waste disposal system.
Practical Ordering Advice
Bin liners are sold in rolls of 25–50 and cartons of 200–1000+. For commercial operations, buying by the carton is significantly cheaper per unit than buying by the roll — typically 30–50% less. If you're currently buying single rolls from a supermarket or convenience supplier, switching to a commercial supplier for this one product line will likely produce immediate cost savings.
- Identify your bins by size and usage type
- Match the correct gauge to each bin type
- Buy commercial quantities — cartons, not single rolls
- Don't use kitchen liners in bathroom bins or vice versa if food safety is a concern