US customs officials found 316,000 glass bongs disguised as Christmas ornaments at the Los Angeles harbour.
US Customs and Border Protection said agents found the highly decorated drug pipes in 860 boxes shipped from China.
The cargo, estimated to be worth more than 2.6 million US dollars, had been described as glass figures and Christmas ornaments.
The bongs were seized at the Los Angeles/Long Beach port complex.
Customs spokeswoman Cristina Gamez said the importer remains under investigation and there have been no arrests. She said it is illegal to import or export drug paraphernalia in the United States.