An Australian men's magazine says 130,000 inflatable breasts intended as a free gift for its January issue have gone missing.

Ralph magazine said a container carrying the plastic breasts left docks in Beijing two weeks ago but turned up empty in Sydney this week, reports News.com.au.

The magazine has put out an alert to shipping authorities but if the breasts didn't turn up in the next 48 hours it would be too late for the next issue, a spokeswoman said.

Ralph editor Santi Pintado urged anyone with information about the missing breasts, said to be worth £85,000, to contact the magazine.

"Unless Somali pirates have stolen them its difficult to explain where they are," Pintado said. "If anyone finds any washed up on a beach, please let us know."

-Nova