Long lines expected at post office on busiest shipping day of the year

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KANSAS CITY, Mo. -- Monday marks the busiest shipping day of the year.

The United States Postal Service is expecting to process more than 640 million cards, letters and packages on Monday alone.

Online shopping is the big reason behind the increase. Leaders with the postal service say record-high online sales on Black Friday and Cyber Monday has had a big impact on the number of packages being shipped.

To get ready for the busy season many companies, including FedEx, UPS, and the post office, have hired extra help for the holidays, and will be delivering on all seven days of the week.

"We have great employees who work diligently because we want everyone to have a great Christmas and make sure those packages get there on time," Twana Barber with the United States Postal Service said.

The last day for ground shipping is Tuesday for those who want to ensure their packages arrive in time for Christmas. Saturday, Dec. 19 is the last day for priority mail, and Monday, Dec. 21 is the last day your package is guaranteed to be delivered in time for Christmas by priority mail express.