Police discovered 43 pounds (19.5 kilograms) of the illegal drug ecstasy during a search of a van after it was stopped to give the driver a random breath test.
New South Wales police said Monday that officers found seven boxes of chemical glassware used to make drugs when the van was stopped last Wednesday outside the town of Quirindi.
Two Sydney men, both 27, were charged with possessing drug manufacturing apparatus and were granted bail after appearing in court that day.
A forensic search of the van later found the hidden ecstasy tablets. The two men were tracked down again and arrested on charges manufacturing and supplying a prohibited drug.
Police say the ecstasy had a street value of about 20 million Australian dollars ($19.7 million).