"postal package" is correct and can be used in written English.
You could use it when talking about a package that is sent through the postal system, either through the mail or a courier service. For example, "I just sent a postal package to my grandmother with a few small gifts inside".
ISLAMABAD, Pakistan Pakistanan's prime minister, Yousaf Raza Gilani, received a postal package containing anthrax spores four months ago, his spokesman said Wednesday, adding a new dimension to the security threats faced by the country's political and military leadership.
"I just assumed that a day or two before the event the mailman would bring us a little postal package full of moon rocks," she later told Mr. Shatner.
A scan of a postal package at San Francisco International Airport led to the discovery of 20 footlong millipedes sent to the U.S. without proper permits, authorities said Friday.
An informed consent form was included in the postal package sent for baseline investigation and was provided by all participants.
The remaining 563 SOLAR II participants with no valid e-mail address available received the postal package including the invitation letter, the informed consent form and the questionnaire during the above mentioned recruitment phases in 2010 and 2012.
Franking, term used for the right of sending letters or postal packages free of charge.
A rapidly growing flood of hundreds of millions of postal packages containing poisons is simply too big to ignore.
"As you probably know, there is a heightened sense of alert among receivers of postal packages," the Half.com e-mail said.
The police said they were tipped off by a call from abroad that warned of the possibility of an explosive device hidden in postal packages onboard the FedEx flight from Yemen.
The police said that the tip warned of the possibility of an explosive device hidden in postal packages onboard a FedEx flight originating from the Yemeni capital of Sana to Dubai, according to a statement released by the official state news agency WAM and reported by The Associated Press.
In the carry deal, FedEx will provide air capacity for the transportation of postal packages.
