Amazon packages represent 15% of the United States Postal Service's package volume, but about 7.5% of their revenue. Amazon is USPS's biggest customer, even though Amazon passed the USPS to become the largest domestic parcel carrier in 2025.

The current Amazon - USPS agreement expires on September 30, 2026, just days before the USPS may run out of the cash required to operate. Amazon has signaled that they would like to replace the USPS with their own network, but doing so will be more expensive than the company may have bargained for.

In this episode of the Art of Supply podcast, Kelly Barner covers the public positioning and power dynamics playing out between Amazon and the U.S. Postal Service:

The history and current status of the relationship between the two organizations
How the U.S. Post Office is trying to bring market pricing into their negotiations with shippers - and how Amazon responded to that strategy
Why the final outcome in this story is something all consumers may be affected by

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