The under-wraps project is rumored to be called Seller Flex.

From its purchase of Whole Foods to its ever-growing base of products, there’s no doubt that Amazon is expanding its network. And now, it’s possible that it’s taking a major step in its delivery efforts. Bloomberg is reporting that Amazon is experimenting with its own delivery service.

The new delivery service is designed to make more products available for free two-day delivery and help alleviate overcrowding in its warehouses. Sources close to the project told Bloomberg that the under-wraps project is being called Seller Flex. If the delivery service is made official, it’ll push Amazon further into a lane currently occupied by its partners, UPS and FedEx. The new system will work by Amazon picking up packages from its third-party merchants and delivering them directly to customers’ homes.

Benjamin Hartford, a Robert W. Baird analyst, told Bloomberg in a note, “Amazon’s final-mile efforts reflect a logical extension of its model as it builds network density.”

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