A Southern Tasmanian man connected to what police called the biggest drugs bust in the state's history has pleaded guilty to trafficking a controlled substance.

Nicholas Mark Stebbins, an ex-bikie, trafficked drugs including amphetamines, MDMA and cocaine with a street value of at least $11 million between August 2012 and July 2014.

Hobart's Supreme Court Justice David Porter heard the 27-year-old from Blackmans Bay was a member of the Rebels Motorcycle Club at the time of the trafficking, but that he had since severed ties with the organisation and handed back his patches in an attempt to rehabilitate.

Defence lawyers told the court that while Stebbins was "part of a group" that imported drugs, he was "certainly not the head" of the operation.

The court heard Stebbins helped arrange and pay for seven parcels filled with drugs to be posted to Tasmania from overseas.

Crown prosecutor Darryl Coates told the court the parcels collectively contained more than two kilograms of amphetamine and about $500,000 worth of MDMA.

The packages were intercepted in Tasmania, Western Australia and Victoria.

Mr Coates told the court Stebbins regularly used the digital currency Bitcoin to pay for the drugs, to avoid using a bank.

Sorry, this video has expired Guilty plea over $11m drug haul ( Tyson Shine )

The court heard police found 17 different financial transactions sent from Stebbins to China, and that when Stebbins made payments at the post office, he used his driver's licence as identification.

The 2014 bust was part of a major police operation involving Tasmania Police, the Australian Federal Police and Australian Customs officers.

Defence lawyers argued that since Stebbins was arrested in July 2014, he had been a "model prisoner" and had re-established relationships with his girlfriend, mother and a series of family friends who would all act as a support base if he were released from prison.

The court heard how Stebbins was doing a certificate in building while in prison, to try and change his future jobs prospects.

But Crown Prosecutor Darryl Coates reminded the court Stebbins had not revealed the source of the money he used to pay for the drugs.

He was remanded in custody and will be sentenced next month.