With the holiday season underway, this week is estimated as the busiest mailing week of the year with around three billion pieces of First-Class Mail, including greeting cards and packages waiting to be processed and delivered. (Photos: VCG)  

In the two weeks before the Christmas, 200 million packages went out from the United State Postal Service (USPS) each week, according to a press release of the USPS.

Letters with Christmas postage stamp were seen at a Merrifield Processing and Distribution Center in the US, December 19, 2018.

Postal employees were sorting packages at the Merrifield Processing and Distribution Center in Fairfax, Virginia.