It may be a little crowded at the post office.

U.S. Postal Service officials anticipate that Monday will be the busiest mailing day of the holidays. In Chicago alone, officials say more than 1.7 million cards will be mailed.

Postal officials say they're reporting a big traffic increase on the service's website. Postal officials say 97 million customers will come to the post office this season and 47.2 million will do online shipping from home. Officials say more than 4.7 million shipping labels are printed from home.

The Postal Service is mulling hundreds of closures nationwide that would slow mail service.

The service has proposed closing 252 mail processing facilities and cutting 28,000 jobs by the end of next year to help the agency curb its mounting financial problems.