Compost caddy liners either help you stick with kitchen composting or become the reason the caddy ends up back under the sink, unused. This guide ranks the eco friendly bin bags for compost caddies that actually break down where you put them, and flags the ones that just look green on the packet.
- Certified compostable liners carrying the seedling logo or OK Compost HOME mark are the only bags proven to break down in a home bin - Buy.
- Uncertified 'biodegradable' bags often need industrial conditions most councils and gardens can't provide - Skip.
- Regn's certified compostable food freezer bags come in 2L, 4L and 6L, covering most standard caddy sizes.
- Paper liners and the no-bag newspaper method both work for 2026 kitchens on a budget - Buy.
Why this matters
A compost caddy that smells or leaks food waste onto your counter gets abandoned within a fortnight. The liner is doing more work than people expect - it's the difference between scraping a caddy clean every night and just tying off a bag.
Most "eco" labelling on bin bags in 2026 is unregulated. A bag can say biodegradable and still take years to break down, or need an industrial composting facility running at 55°C that your garden bin will never reach. Regn's certified compostable food freezer bags are certified to EN13432, which means they're tested to disintegrate within 12 weeks under proper composting conditions - not just marketed as green.
How this list was ranked
Each entry here is judged against three things: certification (does it carry a recognised compostable mark), fit for actual UK compost caddies (most are 5-7 litre countertop bins), and whether it holds up to daily food scraps without leaking. Options that rely on vague "eco-friendly" wording with no certification get marked down regardless of price. This isn't a lab test - it's a practical read on what's worth buying for a kitchen in 2026.
The ranked list
1. Certified compostable caddy liners - the safe pick
Look for the seedling logo or "OK Compost HOME" mark, not just the word "compostable" printed on the bag. These meet EN13432, meaning they're tested to disintegrate within 12 weeks and fully biodegrade within six months under composting conditions. Regn's certified compostable food freezer bags run 2L, 4L and 6L, which covers the small countertop caddy through to a larger under-sink bin. Verdict: Buy.
2. Paper compost caddy liners - the budget pick
Unbleached kraft paper liners cost less than certified plastic-alternative bags and go straight into food waste collections or a garden heap without a second thought. They're weaker under wet, heavy scraps and prone to soaking through if left more than a day or two. Fine for households that empty the caddy every 1-2 days; less reliable for once-a-week emptying. Verdict: Buy for frequent-empty households.
3. Uncertified "biodegradable" bags - the greenwash risk
Biodegradable is not a protected term in the UK the way compostable is under EN13432. A bag can be labelled biodegradable and still be a standard plastic with an additive that only breaks it into microplastic fragments faster, not into compost. If the packaging doesn't show a seedling logo or a specific compostability standard, treat the claim as marketing, not fact. Verdict: Skip.
4. Newspaper wrap - the free pick
Folding newspaper into a makeshift liner costs nothing and works surprisingly well for households already recycling paper. It composts fully, holds most food scraps for a day, and avoids any packaging waste at all. The trade-off is more folding and less capacity than a proper liner, so it suits smaller households better than a family kitchen producing scraps daily. Verdict: Buy for zero-spend setups.
5. Heavy-duty compostable liners for outdoor bins - the specialist pick
Garden waste caddies and larger outdoor food waste bins need a thicker gauge than a countertop liner. Certified compostable bags built for this job resist tearing under grass clippings and larger food waste but cost more per bag than standard caddy liners. Worth it if your council collects garden and food waste together; overkill for a small kitchen caddy. Verdict: Consider for outdoor bins only.
6. Going bagless with reusable wraps - the no-bag pick
Some households skip liners altogether, rinsing the caddy daily and storing dry scraps in reusable containers instead. Pairing this with beeswax food wraps for wrapping produce before it hits the caddy cuts down on how much goes in the bin in the first place. It takes more daily discipline than any bag option here, but it produces zero liner waste. Verdict: Buy if you're happy to rinse daily.
What to avoid
- Bags labelled "eco" or "green" with no certification mark - these are packaging claims, not tested standards.
- Standard plastic bin bags marketed as "recyclable" - recyclable is not the same as compostable, and food-contaminated plastic rarely gets recycled anyway.
- Certified compostable bags used for anything other than food or garden waste - they're not built for general rubbish and can tear under sharp or heavy items.
Comparison table
| Option | Certification | Best for | Verdict |
|---|---|---|---|
| Certified compostable liner (2L-6L) | EN13432 / seedling logo | Standard kitchen caddies | Buy |
| Paper caddy liner | None needed, naturally compostable | Frequent-empty households | Buy |
| Uncertified "biodegradable" bag | None | Nobody | Skip |
| Newspaper wrap | Naturally compostable | Budget, small households | Buy |
| Heavy-duty compostable liner | EN13432, thicker gauge | Outdoor/garden waste bins | Consider |
| No-bag + reusable wraps | N/A | Households happy to rinse daily | Buy |
Where to buy
- Buy certified compostable liners in the size that matches your actual caddy - a 2L bag in a 6L bin means constant re-lining, and a 6L bag in a 2L caddy just wastes material.
- Check for the seedling logo or "OK Compost HOME" wording on the pack before checkout, not just the word "eco" in the product title.
- For the wider kitchen routine around composting, the zero-waste kitchen starter kit guide covers what else pairs well with a compost caddy.
FAQ
What's the best eco friendly bin bag for a compost caddy in 2026?
Certified compostable liners carrying the seedling logo or OK Compost HOME mark, sized to your caddy, are the safest 2026 pick. Regn's certified compostable food freezer bags cover 2L, 4L and 6L sizes and meet the EN13432 standard.
Are compostable bin bags safe for home compost bins?
Only if they carry an OK Compost HOME certification, not just an industrial compostable mark. Industrial-only bags need higher heat than a garden bin reaches and won't break down properly at home.
What's the difference between biodegradable and compostable bags?
Compostable is a tested, certified standard (EN13432) that guarantees breakdown within a set timeframe. Biodegradable is an unregulated term that can mean anything from months to years, with no guarantee of full breakdown.
Can I use newspaper instead of a caddy liner?
Yes, folded newspaper works as a free compostable liner for smaller households emptying the caddy every day or two. It holds less than a proper liner and can soak through with very wet scraps.
Do compostable bags work in council food waste collections?
Most UK councils accept certified compostable caddy liners in food waste collections, but check your specific council's list since a few only accept paper liners or no bag at all. The certification mark on the bag is the detail to check against your council's guidance.
How much do compostable caddy liners cost?
Prices vary by size and pack count, so check current listings rather than relying on a fixed figure. Certified compostable bags typically cost more per bag than standard plastic liners because of the certification and material.
Are all eco bin bags actually compostable?
No. Many bags marketed as eco-friendly or biodegradable carry no certification at all, meaning there's no tested guarantee they break down as claimed. Look specifically for the seedling logo or an EN13432 reference.
Can compostable bags go on a garden compost heap or only in council collections?
Bags certified OK Compost HOME are designed to break down on a garden heap, while industrial-only certified bags need a council or commercial facility. Check the specific certification wording before assuming either will work.
One last thing
The certification detail most people skip is the difference between "industrially compostable" and "home compostable" - a bag can be fully certified and still be useless in your garden bin if it only meets the industrial standard. Check for "OK Compost HOME" specifically if the caddy liner is going anywhere other than a council food waste collection.
