New York, New York - Amazon announced Monday it is opening up its massive shipping and delivery network to any business that wants to use it – not just the merchants who sell on Amazon's website.

The new service, called Amazon Supply Chain Services, lets companies pay Amazon to handle the behind-the-scenes work of getting products from factories to customers' doors. That includes shipping goods across oceans, storing them in warehouses, and delivering packages to homes seven days a week.

Big names like Procter & Gamble, 3M, Lands' End, and American Eagle are already signed up.

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Amazon compared the move to the launch of Amazon Web Services, its cloud computing business.

AWS started as an internal tool Amazon built for itself, then became a massive business by selling that same technology to other companies. Amazon is betting it can do the same thing with shipping and logistics.

Since 2006, independent sellers on Amazon's marketplace have used a program called Fulfillment by Amazon to let the company handle packing and shipping their orders. Amazon said those sellers have shipped more than 80 billion items through the program.

But until now, most of Amazon's logistics muscle was only available to businesses that sold products on Amazon's own site.

The move puts Amazon in more direct competition with shipping giants like FedEx, UPS, and DHL.

On Wall Street, investors punished UPS, which was down 10%, and FedEx, which fell 9%

Amazon was up around 1%.