More than a kilogramme of crystal methamphetamine was found hidden in monastic apparel and a box of pain-killing patches at Suvarnabhumi airport on Wednesday, the Office of the Narcotics Control Board said.
ONCB secretary-general Wichai Chaimongkhon said on Thursday that narcotics officers at the airport found 1.33kg of the drug inside two parcels consigned to Australia.
One parcel, sent from Nong Bon area of Bangkok, contained 490 grammes of crystal meth, or ice, inside an orange monk's pillow packed among other monastic goods.
The other parcel, sent from Khlong Chan Post Office in Bangkok, contained 845g of the drug in packages of painkilling patches.
"We have never found drugs hidden in monastic goods and pain-killing patches before," Mr Wichai said.
His office would share the information, including the addressees, with Australian authorities and would try to track down the people who sent the goods.
He said parcels addressed to Australia, New Zealand, Japan and South Korea were closely examined. They were frequent destinations for drugs smuggled from Thailand, he said.