RockyMtnHighwrote a review of Yakima Sky Box 21 Cargo Box on November 10, 2010
This box has made my life so much easier. It is very large, and I can throw a few pairs of skis and a couple of boards in it, yet also have room for boot bags and other stuff. On roadtrips, it easily swallows a couple of large duffles, camp chairs and sleeping bags for the whole family (leaving much more room in my vehicle).
It is easily adjustable to fit different roof racks, and clamps down on the crossbars very securely. I have used it for multiple trips over at least several years, with no real signs of wear. It's really nice that it can be opened from either side. I have used it in heavy rain, snow and slushy roads and my gear has always stayed dry. And I haven't had any problem with wind noise.