The Best Rooftop Cargo Boxes: 4 Compared (and One to Skip)

RBE top pick

Thule Motion 3 XL

Check price on Amazon See why it wins Compare all

The Thule Motion 3 XL is the most complete box here: huge, aerodynamic, and the easiest to mount, which is why it takes the top spot. The Yakima SkyBox NX 16 delivers most of the same dual-side convenience and security for meaningfully less, making it the value pick for most buyers.

A rooftop cargo box turns a packed-to-the-roof road trip back into a comfortable one, but the gap between a great box and a frustrating one is wider than the price tag suggests. We compared maker specs across four current 2026 boxes spanning budget to flagship and 14 to 18 cubic feet. Two earned a clear buy, one is a solid it-depends, and one is a skip unless your budget is truly fixed.

RBE top pick

Thule

Thule Motion 3 XL

Buy it

The do-it-all flagship: huge, aerodynamic, dual-side opening, and the slickest mount on the roof.

Best for: Families and road-trippers who want maximum space, low noise, and the easiest install, and don't mind paying for it.

$$$$ · flagship

Why we like it

• 18 cu ft with dual-side opening you can work one-handed
• PowerClick mount with a torque indicator that clicks when the box is properly mounted
• Aerodynamic profile built to keep highway wind noise down
• SlideLock system automatically locks the lid and indicates when the box is closed securely

Know before buying

• Flagship pricing
• At roughly 85 inches it can block the rear hatch on smaller SUVs, so measure first

Check price on Amazon Read our detailed assessment ↓

Yakima

Yakima SkyBox NX 16

Buy it

The smart-money pick: dual-side opening and metal locking handles for meaningfully less than the flagship.

Best for: Most buyers who want premium features and dual-side opening without stretching to flagship money.

$$$ · premium

Why we like it

• 16 cu ft with dual-sided opening for access from either side
• Full metal opening handle locks gear inside and the box to the roof
• Universal hardware fits Yakima StreamLine, factory, and aftermarket aero crossbars
• Flat-bottom interior makes the usable space easy to pack

Know before buying

• Shorter than the top pick, at 16 cu ft versus 18
• 16 cu ft is generous but a step below the XL boxes

Check price on Amazon Read our detailed assessment ↓

Thule

Thule Pulse 2 M

It depends

A tidy, short, dual-side box that's ideal for smaller cars but easy to outgrow.

Best for: Owners of smaller cars or shorter roofs who value a compact, easy-clearing box over maximum volume.

$$ · mid-range

Why we like it

• Only about 69 inches long, so it clears most rear hatches with room to spare
• Still gets dual-side opening and the tool-free PowerClick mount
• Matte ASA-ABS shell that Thule says resists sun, scratches and weather
• Central locking system that confirms the box is closed

Know before buying

• 14 cu ft fills up fast for a family of four
• Priced close enough to the roomier SkyBox NX that many buyers should just size up

Check price on Amazon Read our detailed assessment ↓

We'd skip it

SportRack

SportRack Vista XL

Skip it

Big and cheap, but the boxy shape, single rear opening, and basic hardware show where the money was saved.

Best for: Occasional users on a fixed budget who prioritize raw volume over quiet, convenience, and long-term feel.

$ · budget

Why we like it

• 18 cu ft of volume for the lowest outlay here
• Tool-free clamps fit square, round, and most factory bars
• Short 63-inch length clears rear hatches easily

Know before buying

• Tall, boxy profile that likely catches more wind than the sleeker boxes
• Opens only from the rear, so you load from directly behind the car
• Just a single lock, with fewer security features than the pricier boxes

See our pick instead See it at Amazon anyway Read our detailed assessment ↓

How we judged the field

We don’t run our own lab. Instead, we compare what each maker publishes against the specs that actually change your experience on a trip. For rooftop cargo boxes, the criteria that mattered most were: usable capacity in cubic feet versus the box’s footprint; whether it opens on one side or both; the mounting and clamp system, including how confidently it locks to the crossbars; security locks; aerodynamics and wind noise at highway speed; length, because a long box can foul a rear hatch; and shell material and build feel over years of sun and weather. We deliberately chose four current boxes that span budget to flagship and 14 to 18 cubic feet so the trade-offs are easy to see.

The Motion 3 XL is the most complete box in this group and the one most people would be happiest living with. You get a full 18 cubic feet, dual-side opening that genuinely works one-handed, and the PowerClick mount, which clicks once the clamp reaches the right torque so you aren’t guessing whether it’s tight. Thule builds it with an aerodynamic profile to keep wind noise down, and the SlideLock system is a smart touch: it automatically locks the lid and indicates when the box is closed securely. The catches are the flagship price and the length. At roughly 85 inches it’s long enough to interfere with the rear hatch on some smaller SUVs, so measuring before you buy is essential. If space and calm are your priorities, this is the box.

The SkyBox NX 16 is the value-smart choice and the box we’d point most buyers toward first. It keeps the two features that matter most day to day, dual-side opening and a genuinely secure lock, in this case a full metal opening handle that locks your gear inside and the box to the roof, and it does so for meaningfully less than the flagship. Its universal hardware fits Yakima’s StreamLine bars plus factory and aerodynamic crossbars, and the flat-bottom interior makes it easy to pack tightly. It holds two cubic feet less than the Motion 3 XL, and 16 cubic feet is a notch below the XL boxes, but for the money it gives up very little. This is the pick if you want almost everything the flagship offers without the flagship outlay.

The Pulse 2 M is a genuinely good compact box that’s right for a specific buyer. At about 69 inches it’s short enough to clear most rear hatches with room to spare, and it still includes dual-side opening and the tool-free PowerClick mount, so you’re not giving up the conveniences that make the pricier boxes nice to use. Thule says the matte ASA-ABS shell resists sun, scratches and weather. The reason it lands at it-depends rather than buy is volume: 14 cubic feet fills quickly for a family of four, and the box costs enough that many shoppers should simply size up to the roomier SkyBox NX. If you drive a smaller car or have a short roof and value a tidy, easy-clearing box over maximum space, it’s an easy recommendation. If you’re packing for four, look higher up the list.

The Vista XL is tempting on paper: 18 cubic feet for the lowest price here. But the compromises are exactly where you’d expect a budget box to make them. The shape is tall and boxy rather than aerodynamic, and its tall shape likely catches more wind than the sleeker boxes. It opens only from the rear, so you load from directly behind the car rather than from the curb, which is awkward in tight spots. And the single lock is less reassuring than the extra security on the pricier boxes. It clears rear hatches easily thanks to its short length, and the tool-free clamps fit most bars, so it isn’t unusable, it’s just outclassed. Unless your budget is genuinely fixed and you’ll use it only occasionally, you’ll likely wish you’d stepped up to the SkyBox NX.

Thule Motion 3 XL vs Yakima SkyBox NX 16: which should you buy?

These are the two boxes worth agonizing over. The Motion 3 XL wins on the things you notice least until they’re gone: it holds two extra cubic feet, its aerodynamic profile is built to cut noise and drag, and the PowerClick torque indicator confirms a secure mount. The SkyBox NX 16 counters with nearly the same dual-side convenience, an excellent full-metal locking handle, and a price that leaves money in your pocket. The deciding questions are space and noise sensitivity. If you regularly max out a big box, do long highway stretches where quiet matters, or want the most confident mount, pay up for the Motion 3 XL. If 16 cubic feet covers your trips and you’d rather not spend flagship money for the last increment of refinement, the SkyBox NX 16 is the sensible winner and the one we’d buy for ourselves in most cases.

What to look for

• Capacity vs footprint: Match cubic feet to your typical load, but remember taller boxes hold more and create more drag and noise.
• Opening side: Dual-side opening lets you load from the curb and in tight garages; single-side and rear-opening boxes save money but lock you into one loading position.
• Mounting and clamp system: Tool-free clamps that fit square, round, factory, and aero bars are the norm; a torque indicator that confirms a secure clamp is a real confidence boost.
• Rear-hatch clearance: Measure before you buy. A long box can block a raised tailgate on smaller SUVs and hatchbacks.
• Security: Look for locks that secure the lid closed and, ideally, the box to the crossbars; metal handles feel more durable than plastic.
• Aerodynamics and noise: Low, aerodynamic shells generally suit noise and fuel use better than tall, boxy designs.
• Roof weight limit: Confirm your vehicle’s dynamic roof rating covers the box plus its contents, not just the box.

Our final take

A rooftop cargo box is one of the best-value upgrades you can make to a road-trip car, but only if you buy the right one. The Thule Motion 3 XL is our top pick because it’s the roomiest and easiest to mount, provided you confirm it clears your rear hatch. The Yakima SkyBox NX 16 is the box most people should actually buy, delivering dual-side opening and strong security for less. The Thule Pulse 2 M is a smart compact choice for smaller cars but easy to outgrow, and the SportRack Vista XL is the one to skip unless a fixed budget makes the compromises worth it. Decide how much you’ll really pack and how much rear-hatch room you have, and the right box picks itself.

Deciding between the top two? See our head-to-head: Thule Motion 3 XL vs Yakima SkyBox NX 16.

More in Automotive

Roof Cargo Boxes, Explained Plain-English guide → Thule Motion 3 XL vs Yakima SkyBox NX 16 Head-to-head → The Best Steering Wheel Covers: 4 Compared (and One to Skip) The Best Tire Chains: 4 Compared (and One to Skip) Tire Inflators: Which to Buy and Which to Skip Tire Plug Kits: Which to Buy and Which to Skip