Leicester City Council is to collect a wider range of materials in a bid to ramp up its recycling rate.
Orange bags will replace recycling boxes from October, allowing collection of new materials including mixed plastics, metal containers and cardboard.
Waste management contractor Biffa increased recycling by more than 10% during a six-month trial of the project.
The weight of recyclables collected more than doubled to an average of 18.8 tonnes per week. The amount of wheelie bin residual waste collected in the trial areas decreased by 15%.
Biffa general manager Simon Crook said the scheme showed that significant improvements could be made with simple changes to recycling schemes.
He added: “Leicester’s trial showed that by commingling a wider range of dry recyclables, you provide a simpler and easier way for residents to recycle more.
“The city-wide expansion of the scheme should make a notable difference, and the Biffa team is poised to play its part with enthusiasm and commitment.”
Biffa has a 25-year, £300m waste management PFI contract with Leicester City Council.