Rooftop cargo carrier's have a nickname: rocket boxes. It's a misnomer—the blocky dimensions add drag and reduce fuel economy. Which is why Thule's new Sonic Alpine 663 is so smart. It's longer, thinner, and more aerodynamic than most, so it doesn't eat into your gas mileage. And with 11 cubic feet of space, it's still roomy enough to stow ski gear for four.
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