Do free speech rights include the right to carry a backpack?

A case involving protesters, U.S. Army Stryker vehicles and backpacks, that’s right backpacks, is being heard in a federal courtroom in Tacoma.  The civil rights trial comes nearly six years after the actual protests took place at the Port of Tacoma.

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The "no backpack" directive can be heard on this video from the March 2007 protests at the Port of Tacoma.