Cargo Boxes
The Best Cargo Box for an SUV
Cubic feet is the number on the box. The number that actually decides which box you can buy is your vehicle's published roof limit, minus the bars, minus the empty box.
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Everybody shops for a cargo box by volume, and volume is the wrong number to start with. Here is the arithmetic that actually governs.
Take your vehicle’s published roof load limit — for most SUVs that is somewhere between 110 and 176 lb, and it includes everything up there. Subtract your crossbars, usually 12-18 lb. Subtract the empty box: a full-size hard shell is commonly 45-55 lb. What is left is what you can actually pack, and it is frequently under 100 lb.
A hundred pounds sounds low until you weigh a family’s soft luggage, at which point it is usually fine — because a roof box is a volume solution, not a weight one. Sleeping bags, coats, pillows, camp chairs: bulky and light. Books, tools, tinned food, coolers: put those in the car or on the hitch.
Quick picks
Tap any row to jump to the full write-up below. Scores are our editorial judgment on published specifications — not a star rating, and not a product we claim to have tested.
| # | Product | Best for | Score | Price |
|---|---|---|---|---|
| 1 | Thule Motion 3The box most SUV owners should buy: dual-side opening, a low-profile XL option, and the mounting system that gives you the least trouble. | Best overall | 8.6 | |
| 2 | Yakima SkyBox NXLong and narrow by design, which is what lets you run a box and a bike or a boat on the same roof. | Best value, and best next to another carrier | 8.4 | |
| 3 | Thule Force 3Thule's mid-tier box, which replaced the Force XT — most of the flagship's behavior for less money. | Best mid-price hard shell | 8.3 | |
| 4 | INNO Shadow 16When the constraint is the garage door rather than the roof rating, this is the box that fits under it. | Lowest profile, garage clearance | 8.1 | |
| 5 | SportRack Vista XLA large hard shell at well under brand money, provided you can live with single-side opening. | Most volume per dollar | 7.9 |
Prices checked September 25, 2026. Product photographs are representative stock images, not the exact unit. Affiliate disclosure.
#1 · Best overall
Thule Motion 3
The box most SUV owners should buy: dual-side opening, a low-profile XL option, and the mounting system that gives you the least trouble.
- Type
- Hard shell
- Opening
- Both sides
- Sizes
- Several, including a low-profile XL
- Mounting
- Power-Click style quick mount
What works
- Opening from either side means you can load from the curb, not the traffic
- The low XL is the option that clears garage doors other boxes do not
- Quick-mount system tensions to a click rather than to a guess
- Finish and hardware are a clear step above the budget tier
What doesn’t
- The most expensive box here by a distance
- Empty weight eats a real share of a modest roof limit
- Long enough that you must check hatch clearance when mounted rearward
Our scoring
8.6overall
#2 · Best value, and best next to another carrier
Yakima SkyBox NX
Long and narrow by design, which is what lets you run a box and a bike or a boat on the same roof.
- Type
- Hard shell
- Opening
- Both sides
- Shape
- Long and narrow
- Mounting
- Tool-free clamp
What works
- The narrow footprint leaves room alongside for a second carrier
- Genuinely good at swallowing large duffels and totes
- Undercuts the comparable Thule on price
- Dual-side opening at a lower price point than most
What doesn’t
- Narrow means tall — check your garage before, not after
- Length can overhang short roofs; measure your bar spread first
Our scoring
8.4overall
#3 · Best mid-price hard shell
Thule Force 3
Thule's mid-tier box, which replaced the Force XT — most of the flagship's behavior for less money.
- Type
- Hard shell
- Opening
- Both sides
- Sizes
- Roughly 300 to 610 liters
- Replaces
- Thule Force XT
What works
- Size range spans small crossovers to large SUVs
- Dual-side opening at mid-tier money
- Matte shell hides scuffs better than a gloss one
What doesn’t
- Not as refined on the hardware as the Motion 3
- The larger sizes are heavy empty, which matters on a modest roof limit
Our scoring
8.3overall
#4 · Lowest profile, garage clearance
INNO Shadow 16
When the constraint is the garage door rather than the roof rating, this is the box that fits under it.
- Type
- Hard shell
- Profile
- Genuinely low
- Opening
- Single side on most variants
- Best for
- Garages and height-restricted parking
What works
- Measurably lower than the mainstream boxes
- Less frontal area, which helps both noise and fuel
- Suits sedans and low crossovers as well as SUVs
What doesn’t
- Low means less volume — you are trading space for height
- Single-side opening on most variants
- Thinner retail availability than Thule or Yakima
Our scoring
8.1overall
#5 · Most volume per dollar
SportRack Vista XL
A large hard shell at well under brand money, provided you can live with single-side opening.
- Type
- Hard shell
- Opening
- Single side
- Size
- Large
- Brand
- Thule's value label
What works
- The cheapest route to genuinely large hard-shell volume
- Backed by a brand with real distribution and spares
- Perfectly adequate sealing for the price
What doesn’t
- Single-side opening — you will be loading from the road side half the time
- Hardware and latches are clearly built to a price
- Heavy for what it is
Our scoring
7.9overall
Sizing a box properly
Translate volume into something you can picture. Roughly:
- Around 13-16 cu ft — two adults’ soft luggage for a week, or the bulky overflow from a family of four.
- Around 16-18 cu ft — a family of four’s soft luggage, or two adult duffels plus a stroller and camp chairs.
- Around 21 cu ft and up — ski and snowboard length, or a family of five’s bulky gear. Check garage height before you buy.
Then check three physical constraints before you order. Your bar spread must fall inside the box’s stated mounting range. Your roof length must take the box without it overhanging the windshield or fouling the hatch. And your garage height must clear the loaded car, which is the one people discover the hard way.
One-side or two-side opening
This is the feature that separates price tiers, and it is worth more than it sounds. A single-side box opens on the driver’s side only, which means every time you stop somewhere with traffic on that side, you are standing in the road to load.
Dual-side opening is not a convenience feature on a family trip. It is the difference between loading from the pavement at a motel and loading from the lane.
What a box costs you in fuel and noise
Real, and worth planning around. A loaded roof box at highway speed is a meaningful aerodynamic penalty, and it is the single biggest fuel cost of anything on this site — worse than a hitch carrier, worse than bare bars.
We go through what the published testing actually found in do roof racks affect gas mileage, and what it means for an electric vehicle specifically on our Model Y fitment page. If your load is heavy rather than bulky, read roof rack vs cargo box and roof or hitch first — you may be buying the wrong category.
Security and weather
Every box here locks, and every lock on a plastic box is a deterrent rather than a barrier. Treat a cargo box like a glovebox: fine for luggage at a rest stop, not a safe for a camera bag overnight. Our roof box security guide covers what the locks actually stop.
On weather: hard shells are water-resistant rather than submarine-proof, and the lid seal is the part that fails first as boxes age. In heavy rain, dry bags inside a box cost almost nothing and remove the question entirely.
Common questions
What size cargo box do I need for a family of four?
Do cargo boxes leak?
Is a dual-opening cargo box worth paying for?
How much does a cargo box weigh empty?
Sources
Not sure it fits your car?
Our vehicle pages carry the published roof load limit, the roof type by model year, and what actually mounts to it — cited, and honest about what the manufacturer does not publish.
Read next
Thule Motion 3 vs Yakima SkyBox NX
Shape, garage height and room for a second carrier — the real deciding factors.
Roof Rack vs Cargo Box
Why a box needs a rack, what the full setup costs, and when a basket or bag beats both.
How to Load a Cargo Box
What goes in, what stays out, how to distribute the weight, and the pre-drive checks.
Do Roof Racks Affect Gas Mileage?
What the published tests measured, why an empty rack still costs you, and how to cut the loss.