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The Italian-built module’s more than 17,000 pounds of cargo includes four experiment racks along with the final private crew quarters. This is the final roundtrip to the station for the 21-foot-long, 15-foot-diameter Leonardo. Once back on Earth, the module will be reconfigured with increased shielding on the outside for the STS-133 mission in September when it will be left on the station as a permanent module.