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Today on our 2009 Mazda3, we'll be test fitting the Thule Sonic XXL Rooftop Cargo
Box measuring 22 cubic feet in metallic silver, part number TH636S. With the SportRack Roof
Rack System on our vehicle, we'll begin our test fit by placing the Sonic directly
onto our load bars. With the feet hanging out of the bottom of the box, we can adjust
them as necessary to fit around each bar. We'll also check here at our rear antenna
to see if our box is making contact. It does make contact, so we'll want to be sure
to remove our rear antenna. We'll open the passenger's side of the box and use
the 2 hand knobs on the side to tighten our feet around our bars. When our feet are all
the way secure, the hand *** will start making a clicking noise to ensure
that it's tight.