Ask your local takeaway to fill your own container, or use a returnable-container scheme if your city has one. Choose venues that use certified compostable or fibre packaging as a fallback.
A plastic takeaway container weighs around 20 g; one a week avoided is about 1 kg a year. Zero Waste Europe's 2023 economics study found reusable takeaway containers reach return on investment for operators in years three to four, provided return rates are high.
The catch: some venues refuse customer containers on hygiene grounds, and compostable fibre boxes may be PFAS-treated unless certified; ask.