A woman who probably just wanted to sit somewhere quiet and do some stretching and meditation accidentally ended in the middle of a drug trafficking scheme.

The US woman ordered a yoga mat online - but instead received US$400,000 worth of drugs.

A package containing 20,000 oxycodone pills arrived in the mail much to the surprise of the unnamed woman, who innocently expected a Walmart yoga mat.

The pills were spilling from the box so she didn't have to open the package before knowing she had to call the police.

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A drug unit commander told WSOCTV that drugs are often shipped to empty homes with someone sitting outside waiting for the package to arrive.

"Vacant apartments, homes where people have gone to work for the day," Marvin Brown said.

He added that this was probably meant to be one of those situations but things had clearly gone wrong.

The package was addressed to the woman's former apartment (which has been empty since she moved out) but the address was misspelled.

The post office caught the mistake and forwarded the package to the woman's current address.