Put loose fruit and vegetables straight in your basket, or use lightweight washable mesh bags for small items. Most checkouts will weigh produce in a mesh bag without complaint.
Western Australia banned produce bags for dry goods from October 2025 and is extending the ban to meat, fish and dairy barrier bags in 2026; the EU's Packaging and Packaging Waste Regulation (PPWR) will ban single-use plastic packaging on fresh produce under 1.5 kg from 2030. At roughly 3 g per roll bag and three a week, the saving is around 450 g a year.
The catch: mesh bags are usually polyester, so buy a few and keep them for years; a cotton or hemp version sheds less persistent fibre but needs many uses to pay back.