The U.S. Postal Service and Internet auction site eBay have teamed up to offer a co-branded Priority Mail shipping service. Special boxes with a flat rate of $7.70, regardless of weight or destination, can be used by those who buy or sell items through the eBay Web site, the firms said on Monday. The boxes come in different shapes and sizes and carry logos of both USPS and eBay.

The service will launch on Thursday, the first day of the eBay Live conference scheduled for San Jose, Calif. The three-day conference is an annual feature organized by eBay to familiarize its new customers with online auctioneering rules. The Post Office launched the flat-rate boxes during last year's holiday season.

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