26/03/2026
Certain shops that issued compostable carrier bags at the checkouts have recently re-evaluated the environmental impacts of these bags over their lifecycle - including disposal in the real world where composting infrastructure is somewhat limited - and have decided to pull them from sale in favour of promoting reusable bags.
I follow a number of groups where members have expressed outrage at this decision, claiming that compostable bags were eco-friendly and could be used in food waste caddies.
If only things were that straightforward.
Food waste in Devon isn't composted - it's treated by anaerobic digestion to generate electricity and soil improver. Composting uses oxygen. Anaerobic means 'without oxygen'. Compostable plastic requires oxygen to break down, so it won't in anaerobic digestion.
And single-use compostable bags potentially have a greater carbon when they are not actually composted: https://www.forbes.com/sites/jamiehailstone/2023/01/23/are-compostable-bags-as-environmentally-friendly-as-we-think-they-are/
Why do we even ask you to bag your food waste at all? And how come you can use any bag?
Unbagged food tends to spill on our workers. While they wear PPE, it isn't nice working in clothes coated in food.
Loose food also releases spores and foul odours when the worker opens the caddy - again, extremely unpleasant.
ALL bags - even compostable ones - will be removed at the processing plant and sent to Energy from Waste.
But compostable bags are more difficult to remove because they are stretchy.
And they're expensive, so don't waste your money on them.
You can use old bags, like bread bags, salad bags and cereal box liners. You can also use paper bags, but these may rot through (and remember that making and transporting heavy paper - even recycled paper - is still resource-heavy).
You don't need to tie the bag; just fold over the top when it's full and that will be sufficient to stop spills and odours.
Ultimately, do what you feel comfortable with, but just make sure your food is bagged.