With simpler recycling now rolling out across the UK, more households are using food waste caddies than ever before.
With this change, many households are asking questions like:
- What bags should I use?
- Are caddy liners even necessary?
- Do compostable liners actually make a difference?
The reality is that food waste recycling doesn’t operate in a single, perfect system. Different councils use different treatment methods, especially as new food waste schemes roll out, as part of Simpler Recycling. This guide looks at compostable liners, food waste caddies, and bag choices as they work in everyday life
Do you actually need a liner for a food waste caddy?
In theory, food waste can be placed loose into a caddy. In practice, most households find this difficult to maintain.
Without a liner, food residue builds up quickly inside the caddy. Moisture, smells, and food stuck to the base mean the caddy needs frequent washing, and in warmer weather this can quickly attract flies. For many people, this added effort is enough to stop them using the food waste service consistently.
Liners don’t exist to make food waste recycling look better on paper, they exist to make food waste disposal more hygienic and easier to manage day to day. When food waste systems are unpleasant to use, participation drops and food waste ends up in general waste instead.
What bags can I use in a food waste caddy?
This is one of the most searched questions. The most common options are either one or several of the following:
- No liner at all
- Using compostable food waste liners
- Newspaper
- Reusing old bread bags, cereal liners or carrier bags
Each option has trade-offs, and councils vary in what they recommend.
Is reusing bread bags or plastic bags more sustainable?
Reusing plastic bags is often promoted as a sustainability win, and in some contexts that’s true. Using a bread bag twice instead of once does extend its life.
However, once a plastic bag is used to collect food waste, it becomes contaminated. At that point, it can no longer be recycled through soft-plastic collections often found at supermarkets or council plastic recycling. Instead, it will be removed at a treatment facility and usually disposed of or incinerated for energy.
This then makes you wonder... is it more sustainable to recycle your plastic bags into new soft plastics?
There’s also a practical issue. Bread bags and cereal liners are not designed to fit food waste caddies. They slip, tear, and are awkward to tie, which leads to spills, mess, and frustration. Over time, that inconvenience reduces participation, which undermines the environmental benefit of reuse in the first place.
Reuse only works if it doesn’t discourage people from using the system.
Why fit-for-purpose liners improves participation
One of the most overlooked factors in food waste recycling is design. Compostable liners are made in specific sizes to match common food waste caddies, which makes a noticeable difference in use.
When a liner fits properly, it sits neatly inside the caddy, is easier to lift and tie, and is far less likely to leak. That reduces residue inside the bin, cuts down on smells, and means the caddy needs cleaning less often.
This may sound minor, but behaviourally it’s significant. Food waste recycling is far more likely to stick when it’s clean, predictable, and low-effort. Purpose-made liners reduce these issues, and therefore directly improve participation.
What actually happens to liners at anaerobic digestion plants?
Some councils send food waste to anaerobic digestion (AD) plants, where organic material is converted into biogas. At these facilities, liners are usually removed before digestion, whether they are plastic or compostable.
Some AD plants actively prefer plastic liners because they are easier to detect and strip mechanically. Thin, highly elastic compostable liners can sometimes stretch and wrap around equipment, which can be caused more by blended eco liners or plastic mixed biodegradable liners. However, some AD plants do not want plastic liners due to potential plastic contamination.
This isn’t simply a compostable-versus-plastic issue, material composition matters. Compostable liners are generally easier to handle than very thin, stretchy films. Design choices such as thickness and strength have a real impact on how liners behave in processing systems.
Strong in use, designed to break down afterwards
A well-designed compostable liner is intended to be strong during use, but not designed to last indefinitely.
Many users notice that compostable liners begin to break down more quickly in warm or damp conditions. That breakdown doesn’t mean the liner is weak, it reflects a material that responds to certain environmental conditions well.
This controlled failure is important. If a liner escapes AD stripping or ends up in composting or landfill environments, it reduces long-term persistence and avoids the long presence associated with conventional plastic.
Why material choice still matters
No waste system removes 100% of unwanted material.
Conventional plastic persists, fragments, and contributes to long-term pollution if it escapes removal. Compostable liners are designed not to persist in the same way, reducing long-term environmental harm.
Where waste ends up in refuse bins, large compostable bin bags can be a better option, especially if sent to landfills.
Do compostable liners help with smells and hygiene?
This is one of the most practical reasons households choose compostable liners.
By containing moisture and residue, liners significantly reduce odour build-up and make food waste caddies easier to manage. This is especially noticeable in flats, shared housing, and family kitchens where food waste is generated daily.
Cleaner caddies lead to:
- Fewer complaints
- Less washing
- More consistent use
Which benefits both households and councils.
Always check your council’s guidance
Food waste rules vary between councils. Some specify particular liner types or colours, while others discourage liners altogether.
Before choosing a setup, it’s always best to check your local council’s website for the most up-to-date guidance. Following local rules helps reduce contamination and ensures collections run smoothly.
Choosing the right food waste caddy and liner
A good food waste setup focuses on several things:
- Ease of use
- A well-sized kitchen caddy
- Liners that fit properly
This removes much of the inconvenience that puts people off food waste recycling.
Popular designs such as Easy Eco, Joseph Joseph and Brabantia food waste caddies are widely used because they prioritise usability, from lid design to ease of emptying.
When combined with a purpose-made compostable liner, they make food waste recycling simpler, cleaner, and far more likely to become a habit.
Are compostable liners worth using?
Compostable liners don’t fix every problem in the waste system, and they aren’t intended to.
What they do is:
- Make food waste recycling work better in real homes
- Reduce misuse of random plastic bags
- Lower long-term environmental risk where systems aren’t perfect.
They’re not about being ideal, they’re about being practical.
And in food waste recycling, practicality is what keeps people participating.