What it the difference between the Yakima...
What it the difference between the Yakima Sky Box Pro 21 and the Yakima Sky Box 21? I don't see any difference except maybe the colors
The finishes used on the two boxes is where they differentiate. The finish that is used on the Pro series is a higher quality, automotive type finish that includes a better scratch-resistant protective coating. Also, the Pro comes with an integrated gear management system along with the cargo net.