How many fit
15 of the 26 models checked meet every need here: “Luggage for a family of four”.
15 models fit, out of 26 checkedPicked for one job
The best roof box for a family of four
Top pick
Thule Motion 3 XXL
Thule Motion 3 XXL gives you the most verified volume in this set, 21 cubic feet, as long as your roof and hatch can accommodate its size and weight.
Why it suits this job
- Capacity is 21 cubic feet.
- Gear up to 215 centimeters long fits.
- The catch
- Among the longest and widest boxes listed here, it calls for exact checks of hatch clearance and roof length.
- Go with Yakima SkyBox NX XL if
- what decides it for you is packing for a family of four
More reasons we picked it
- Dualside access is how it opens.
- Published exterior dimensions are about 91.3 x 36.2 x 18.1 inches.
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At 21 cubic feet, Thule Motion 3 XXL has the most verified volume in this set, as long as the roof and hatch can handle its size and weight.
By the numbers
What the data shows
What we found across the roof cargo boxes we compare, plus the checked facts behind each finding.
Why it helps
At 21 cu ft, Thule Motion 3 XXL has the largest listed cargo volume of the comparable models.
- Thule Motion 3 XXL
- 21 cu ft
- Typical (median)
- 16 cu ft
- Models with this figure
- 20 of 26
Show the facts and the math
How we countedThe count uses each product's current fit ratings for “Luggage for a family of four”. A need with no documented match is not counted.
How we calculatedFigures are the published exterior-category volume. Shape, mounting hardware and long gear can leave less room to pack. The median draws on the 20 of 26 models that publish comparable figures.
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Thule Motion 3 XXL |
|
| |
| Yakima SkyBox NX XL |
|
| |
| Rhino-Rack MasterFit 530L |
|
|
Decision guide
How to choose for this job
Thule Motion 3 XXL gives you the most verified volume in this set, 21 cubic feet, as long as your roof and hatch can accommodate its size and weight.
What settles the choice
With 21 cubic feet, it ranks among the longest and widest boxes here, so hatch and roof length need an exact check.
What puts Thule Motion 3 XXL ahead
You get 21 cubic feet, and gear up to 215 centimeters long fits inside.
When another box is the better fit
Yakima SkyBox NX XL is the one to choose if packing for a family of four is the deciding need. Rhino-Rack MasterFit 530L is likewise the choice when packing for a family of four decides it.
What this page can’t tell you
- Vehicle compatibility cannot be certified by this screen.
- A published volume figure cannot promise that a given suitcase layout will fit.
- Roof limits depend on the vehicle configuration.
3 options
The top pick and the alternatives
Thule, Motion 3 XXL Black Glossy
Thule Motion 3 XXL
You get 21 cubic feet of space, with room for gear up to 215 centimeters long.
Top pick iftransport skis with the seats left up and pack for a family of four
Key facts
- Capacity is 21 cubic feet.
- Gear up to 215 centimeters long fits.
The catch
Among the longest and widest boxes listed here, it calls for exact checks of hatch clearance and roof length.
Yakima, SkyBox NX 18 XL
Yakima SkyBox NX XL
You can fit gear up to 195 centimeters long in its 18 cubic feet.
Pick this instead ifwhat decides it for you is packing for a family of four
Key facts
- Capacity is 18 cubic feet.
- It accepts gear up to 195 centimeters long.
The catch
200 cm Nordic skis are a little longer than its 195 cm ski limit.
Rhino-Rack, RMFT530A
Rhino-Rack MasterFit 530L
You get 18.7 cubic feet, with space for gear up to 210.8 centimeters long.
Pick this instead ifyour deciding need is packing for a family of four
Key facts
- Capacity is 18.7 cubic feet.
- Gear up to 210.8 centimeters long fits.
The catch
With an 85-inch shell, hatch and roof length both need careful checking.
Ready to buy
See today’s price and what owners say
Top pick for this job
Thule Motion 3 XXL
Capacity is 21 cubic feet.
See price & reviews on AmazonPick this instead if
Yakima SkyBox NX XL
what decides it for you is packing for a family of four
See price & reviews on AmazonWe may earn a commission from qualifying Amazon purchases. How we make money