This should be the busiest day of the year for FedEx, and 10% busier than last year's busiest day. 

Company officials say they expect to move some 17 million packages around the world today.  That's compared to 15.6 million on the biggest shipping day last year.

It is due to combination of sending gifts and restocking shelves for the final holiday rush.

U.S. online sales in the holiday season to date are up 15 percent to $24.6 billion, according to comScore.
 
The Reston, Va., research firm says sales on six individual days during the first 39 days of the November-to-December shopping season have exceeded $1 billion, led by Cyber Monday, the Monday after Thanksgiving.
 
ComScore Chairman Gian Fulgoni predicts this week will be the heaviest week of the season for online retailers. He says ``all signs are now pointing to a strong finish to the season.''
 
Over the past six years, so-called ``Green Monday'' - traditionally the second Monday of December - has consistently ranked among the top spending days of the season.