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A cargo box effectively allows you to double your trunk space by moving bulky items from your car’s interior or trunk to its roof. After gathering up as much intel as we could about rooftop cargo boxes from experts, retailers, manufacturers, customers, and outdoor-gear reviewers, we’ve concluded that of the 21 boxes we surveyed, the Yakima SkyBox NX 18 offers the best combination of features, build quality, and value pricing for most road trips.

The NX line replaces the Carbonite line of Yakima boxes, which included our previous cargo box pick, the SkyBox 16 Carbonite.

The cargo box’s low-drag aerodynamic design minimizes wind noise and reduces the impact on fuel economy. Its 18 cubic feet of space allows it to hold skis, duffle bags, backpacks, sleeping bags and other camping gear, or any random (though fairly lightweight) stuff, and it does so securely—both in solidly mounting to your roof rack and in resisting theft. If you don’t have a rack already, this REI car rack buying guide is a good place to start, but be sure to consult your car’s owner manual to see how much weight its roof can bear.

The SkyBox NX 18 is easy to use. Like most cargo boxes these days, it uses sliding brackets, rather than one or two fixed spots, for attachment to the crossbars, making perfect positioning a snap. To secure the brackets to the crossbars, you use a simple torque wrench (included) that will announce with an audible click—like a gas-tank cap—when you’ve tightened the four installation bolts down securely. The tool lives inside the cargo box, though out of the way of your gear, for safekeeping.

Once installed, the SkyBox NX 18 allows easy access from either side of the car, and its newly redesigned dimensions (a change from the previous model) make it less likely to interfere with a liftgate if you put it on a hatchback or station wagon.

If you need more space, Yakima’s older-generation 21-cubic-foot model (the company has not released an updated, NX 21 version so far) may still be available for purchase. Be aware, however, that this box weighs more and can encourage overloading past your car rack’s weight limit, which might be lower than you expect. It may also be too long in the back to clear some liftgates. As Ken Klaes, general manager of ReRack, a Portland, Oregon–based cargo-box retailer and rental company, explained to us: “A rack designed to carry 150 pounds doesn’t forget that the box is there; the weight of the box itself (often 50-ish pounds) needs to be subtracted from the weight rating to give you a real capacity for the box.”