Today we'll be reviewing the Thule Sonic Medium rooftop cargo box, part number TH634B. This cargo box is a great way to carry anything from groceries to carry-on luggage for up to three people. The pre-installed AcuTight mounting clamps allow for a simple 5-minute installation onto your rooftop crossbars. To mount the Sonic Large, simply place the box onto your roof and center the clamps over the… see more >