Sainsbury's is to give out 400,000 free Jugit milk containers on Saturday in a bid to drive the popularity of buying milk in bags. On Saturday (15 May), 500 Sainsbury's stores will be giving away some 400,000 Jugits, which are manufactured by rigid plastics group RPC. Emma Metcalfe-King, senior dairy buyer, said: "Milk bags are a great way for us to help the environment and when you can pick one up in store for free, they're a great way to help the family budget." The milk bag costs 6p less than the equivalent bottle and Sainsbury's said the moving from bottles to bags would save 1.4m tonnes of packaging a year. Only one in four plastic milk bottles are currently recycled, Sainsbury's said.