Cyber Monday is the biggest online shopping day of the year, and retailers are investing hundreds of millions of dollars in brand new facilities to handle the rise in package orders. NBC News' Brian Cheung has an inside look at one of the newest and biggest facilities in the country.

After lackluster spending at U.S. stores on a deals-heavy Black Friday, retailers will be pulling out all the stops with steep promotions on their websites and apps to entice people to buy holiday gifts and other merchandise after the long Thanksgiving weekend.