The U.S. Postal Service kicked off its busiest time of year Monday, with special festivities at the Washington, D.C., National Postal Museum.
Kids packed into the museum for presents from Santa Claus and to meet "Al, the letter carrier," made popular by USPS television commercials.
Attendees listened to Christmas music, sang carols, and learned just how massive mailing will be this holiday season.
"The Postal Service will deliver nearly 60 billion cards, letters, and packages across the country and around the world," Postal Service Operations Director Steve Forte said. "On our busiest mailing day, we'll be processing over 800 million packages on Monday, Dec. 20."
Some of the most precious cargo will be the more than 30 million pounds of mail to U.S. military members stationed around the world.