Demand for face masks at Co-op stores has outstripped everyday essentials such as bread and milk.
The non-medical grade protective gear, sold for £3, has become the convenience retailer's best-selling product following the government's announcement that face coverings must be worn on public transport.
The masks have been available at all branches across Kent since the end of May.
As a result of the sales boom, Co-op has bulked up on its stock and has millions more items ready to hit the shelves.
Customers have been snapping up either the five-pack of disposable masks, or a single reusable face covering which can be used up to 20 times. Both products cost £3.
Joseph Turner, Co-op buying manager, said: “As a community retailer with a store in every postal area, this move ensures our customers and members can get access to face coverings easily.
"We know it’s important to reserve valuable PPE for health and care workers so these are not suitable for medical use but have been designed with customers in mind and are just one way we can be careful, along with social distancing and washing our hands.
"Following the demand, we have secured more stock to ensure we can continue to serve the nation."