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They definitely make ski boxes that are big enough to hold four pairs of skis and boots. My dad has a Yakima one, and we've stuffed 4 pairs of skis/poles, 3 snowboards, 7 pairs of boots, and a small suitcase up there before. I don't think we'll ever be able to do it again, but you get the picture. I'm not sure what model it is, but it clips right to the racks on top of the car so we didn't have to buy the weird metal bars.
I think this is probably what we have, but ours is like 10 years old.
fffffuuuuu quad post....but I think we actually might have this one. The one we have is fucking big.