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The USPS expects to process 400 million packages during that time period. That's a 10 percent increase over last year.
Seven million pieces of mail will pass through the main post office in San Jose alone --169,000 of those "pieces" will be packages.
The facility, on Lundy Avenue, is a big as four football fields.
The machines there move 10,000 packages an hour.
"Until somebody figures out how to email a sweater, we're going to deliver it," said Augustine Ruiz, USPS Bay Area Spokesperson.
Like Santa Clause, the postal service does deliver on Christmas Day -- but prepare to pay a premium.
Here are some holiday shipping deadlines:
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Monday, Dec. 18: UPS three-day select
Tuesday, Dec. 19: FedEx Express Saver and USPS first class (this includes greeting cards)
Wednesday, Dec. 20: FedEx two-day, UPS 2nd Day Air, USPS Priority Mail
Thursday, Dec. 20: FedEx Overnight, UPS Next Day Air
Friday, Dec. 22: USPS Priority Mail Express
Monday, Dec. 25: FedEx Same Day
Click here for more holiday stories.