Best Cargo Boxes for Kia Carnival Roof Rails: Thule vs Yakima Reviews
There’s a specific moment in the Kia Carnival—when you’re packing for a family road trip and realize that even with 145.1 cubic feet of interior space, you still can’t fit everyone’s luggage, the camping gear, and that awkwardly shaped thing your kid refuses to leave behind—that you start looking up at the roof.
The Carnival’s roof rails aren’t just for show. They’re your ticket to expanding your family’s carrying capacity without squeezing passengers or folding seats. And when it comes to roof cargo boxes, two brands dominate the conversation: Thule and Yakima. Both offer quality, durability, and style—but which one is right for your Carnival?
TL;DR
The Kia Carnival’s factory roof rails can support up to 220 lbs (100 kg) of dynamic load while driving . Thule and Yakima offer excellent cargo boxes ranging from 11 to 22 cubic feet of capacity, with mounting systems that install without tools. For Carnival owners, the Thule Motion XT series wins for aerodynamics and fuel efficiency, while the Yakima CBX series offers rugged styling and superior hatch clearance . Consider your typical cargo volume, budget, and whether you prioritize sleek design or bold looks. Always check hatch clearance—some XL boxes may contact your rear liftgate when open .
Why Your Carnival Needs a Roof Cargo Box
Before we dive into the Thule vs Yakima showdown, let’s talk about why a roof box makes sense for Carnival owners.
The Carnival is already spacious. With all seats up, you’ve got 40.2 cubic feet behind the third row. Fold those seats, and you’re looking at 145.1 cubic feet of cargo space. So why add a roof box?
Real-world family travel reality:
- Seven passengers means seven suitcases, plus carry-ons
- Sports equipment doesn’t pack efficiently
- Coolers and camping gear take up massive floor space
- The “I need this during the trip” stuff belongs inside; the “I need this at the destination” stuff can go on top
A cargo box frees up interior space for passengers to stretch out. It separates dirty gear from clean luggage. And it keeps the cabin from looking like a packing disaster zone.
According to Rack Attack, a cargo box is a game-changer: “More space, more comfort, less mess. What’s not to love?” .
Understanding Your Carnival’s Roof Rails
Before buying any cargo box, you need to understand what your Carnival comes with.
Factory Roof Rail Capabilities
The Kia Carnival’s roof rack can support up to 880 lbs (400 kg) when parked, but that’s static load—like when you’re loading it or sleeping in a roof tent. While driving, the dynamic load limit drops to 220 lbs (100 kg) . That’s the total weight of your cargo box plus everything inside it.
Critical safety notes from Kia :
- Never exceed 220 lbs while driving
- Distribute weight evenly side-to-side and front-to-back
- Avoid sudden starts, hard braking, and sharp turns—the center of gravity is higher
- Check attachments frequently during your journey
- If you have a sunroof, don’t operate it with cargo on the roof
Do You Have Rails Already?
Some Carnival trims come with factory roof rails; others don’t. If your Carnival didn’t include them, you’ll need to install aftermarket rails or crossbars first . Reputable aftermarket options are available, but professional installation is recommended if drilling is required.
Once you have rails, you’ll need crossbars to attach a cargo box. Both Thule and Yakima offer crossbar systems compatible with the Carnival’s factory mounting points.
Kia Insiders Tip: If your Carnival has a sunroof, be careful when positioning your cargo box. Don’t let it interfere with sunroof operation, and never open the sunroof with cargo on the roof .
Thule vs Yakima: The Brand Philosophies
Before comparing specific models, it helps to understand what each brand stands for.
Thule started in Sweden in 1942 and has built a reputation for innovative design, sleek aesthetics, and class-leading aerodynamics . Their boxes tend to look like they’re part of the vehicle, not an afterthought. Thule focuses heavily on reducing wind noise and improving fuel efficiency.
Yakima was founded in 1973 in the United States and appeals to the adventure-seeking crowd with practical, user-friendly designs . Their boxes often feature bolder, more angular styling that stands out. Yakima emphasizes ease of use and rugged durability.
As one reviewer put it: “Thule’s sleek, streamlined design reduces wind resistance while driving. Yakima’s bold, angular designs stand out visually, appealing to outdoor enthusiasts who want their gear to represent their adventurous spirit” .
Top Thule Cargo Boxes for Carnival
Thule offers several series, but two stand out for Carnival owners: the Force (value) and Motion XT (premium).
Thule Force Series: Great Value, Solid Performance
The Force series is Thule’s entry-level line, offering dependable performance without breaking the bank . For Carnival owners, the sweet spot is likely the Force Large (16 cu ft) or Force XL (18 cu ft) .
Force Series Sizes :
- Sport: 11 cu ft (compact, good for smaller loads)
- Medium: 14 cu ft
- Large: 16 cu ft
- XL: 18 cu ft
- XXL: 21 cu ft
Why it works for Carnival: The Force series offers reliable weather protection and secure mounting at a more accessible price point. It’s perfect for families who use a cargo box occasionally and want solid performance without premium features.
Thule Motion XT Series: Style Meets Performance
This is Thule’s best-selling line for good reason. The Motion XT series offers sleeker styling, better aerodynamics, and premium features that make it a joy to use .
Motion XT Sizes :
- L: 16 cu ft
- XL: 18 cu ft
- XXL: 21 cu ft
- XL Low: 14 cu ft (lower profile for better clearance)
- XXL Low: 18 cu ft
Key Features:
- Class-leading aerodynamics = better fuel economy on highway trips
- Dual-side opening for easy access from either side of the vehicle
- PowerClick mounting system with torque-limited claws—just twist until it clicks, and you’re locked in
- Available in Gloss Black or Titan Gray with a white interior that makes it easier to see your gear inside
- Optional accessories: fitted liners, motion-sensor LED lighting, and color-coded storage bags
Why it’s great for Carnival: The Motion XT’s aerodynamic focus helps offset the fuel economy hit from roof cargo. The dual-side opening is a genuine convenience when you’re parked in tight spaces. And that white interior? Game-changer for finding small items at night.
According to Rack Attack, “We love it: class-leading aerodynamics = better fuel economy, dual-side opening, and quick-mount PowerClick system” .
Top Yakima Cargo Boxes for Carnival
Yakima’s lineup includes the budget-friendly SkyBox NX and the premium CBX series.
Yakima SkyBox NX Series: Budget-Friendly and Functional
The SkyBox NX is Yakima’s answer to the Thule Force series—a solid, functional box at an accessible price point .
SkyBox NX Sizes :
- NX12 (Skinny): 12 cu ft (great for narrower roofs)
- NX16 (Large): 16 cu ft
- NX18 (XL): 18 cu ft
- NXXL: 22 cu ft
Key Features:
- Sleek design that works well on compact to mid-size vehicles
- Easy installation with a torque-limiting mounting tool stored inside the box
- Durable construction with good weather resistance
Why it works for Carnival: The NX16 or NX18 hit the sweet spot for Carnival-sized loads. The stored mounting tool means you’ll never lose it, and the straightforward design keeps things simple.
Yakima CBX Series: Rugged, Stylish, and Feature-Rich
The CBX is Yakima’s premium offering, featuring aggressive styling that matches modern SUV aesthetics . For Carnival owners who want their van to look as adventurous as it is practical, this is the choice.
CBX Sizes :
- CBX 16 (Large): 16 cu ft
- CBX 18 (XXL): 18 cu ft
Key Features:
- Rugged, angular design that stands out visually
- Class-leading hatch clearance—crucial for Carnival owners
- Sleek, flush-mount system keeps the inside of the box flat with no clamps getting in the way
- Removable torque tool for easy install and removal
- Dual-side access for loading from either side
- Thoughtful design makes it easier to load long or awkward items like skis or camping gear
Why it’s great for Carnival: The CBX’s standout feature is that hatch clearance. The Carnival’s rear liftgate swings up and back—if your cargo box extends too far forward, it can hit the open hatch. The CBX is engineered to minimize this interference.
As Rack Attack notes, “The CBX includes dual-side access, and its thoughtful design makes it easier to load long or awkward items like skis or camping gear” .
Head-to-Head Comparison
To help you decide, here’s how the premium models stack up against each other.
Thule Motion XT vs Yakima CBX
| Feature | Thule Motion XT | Yakima CBX |
|---|---|---|
| Design Philosophy | Sleek & aerodynamic | Rugged & angular |
| Mounting System | PowerClick (tool-free, built-in) | Removable torque tool (stores in box) |
| Interior | White option available (great visibility) | Dark only |
| Dual-Side Opening | Yes | Yes |
| Hatch Clearance | Good (check low-profile versions) | Class-leading |
| Sizes for Carnival | 14-21 cu ft | 16-21 cu ft |
| Best For | Fuel efficiency, clean looks, white interior | Rugged style, maximum hatch clearance |
Capacity Comparison: All Models
| Model | Small | Medium | Large | XL | XXL |
|---|---|---|---|---|---|
| Thule Force | 11 cu ft | 14 cu ft | 16 cu ft | 18 cu ft | 21 cu ft |
| Thule Motion XT | — | 14 cu ft (Low) | 16 cu ft (L) | 18 cu ft (XL/Low) | 21 cu ft (XXL) |
| Yakima SkyBox NX | 12 cu ft | — | 16 cu ft | 18 cu ft | 22 cu ft |
| Yakima CBX | — | — | 16 cu ft | 18 cu ft | — |
*Data compiled from multiple sources *
Visualizing the Options
To help you match cargo capacity to your family’s needs, here’s how the different sizes compare.
*Cargo box sizes by brand and model. Choose based on your typical load.
The Critical Factor: Hatch Clearance
Here’s something many Carnival owners overlook until it’s too late.
The Carnival’s rear liftgate swings up and back. If your cargo box extends too far forward over the roof, it can contact the open liftgate. This can scratch your box, damage your liftgate, or both.
How to avoid this:
- Measure before buying: Know the distance from your front crossbar to your fully open rear hatch
- Look for low-profile models: Thule offers “Low” versions of the Motion XT specifically for this reason
- Consider the Yakima CBX: It’s designed with class-leading hatch clearance
- Visit a specialist: Rack Attack stores can measure for you and guarantee compatibility
“Hatch clearance is the distance from the front crossbar on your roof rack to your fully open rear hatch. If your box hits the hatch when it’s open, it’s too big for your vehicle. Simple as that” .
Mounting Systems: How They Work
Both brands have developed excellent mounting systems that make installation quick and secure.
Thule’s PowerClick System
- Dual-sided claws clamp onto your crossbars
- Torque-limited—you twist until you hear a click, confirming proper tightness
- System is built into the box—no tools needed
- Fast, safe, and user-friendly
Yakima’s Quick-Dial Tool System
- Single claw per mounting point
- External tool (included, stored in the box) used to tighten
- Clicks when secure
- Leaves a flatter box interior = more usable space
Both systems are excellent. The Thule system is slightly more convenient because the mechanism is integrated. The Yakima system gives you a slightly cleaner interior because the clamps are flush when not in use.
Which Size for Your Family?
Choosing the right capacity depends on your typical travel load.
| Family Size | Trip Type | Recommended Capacity | Example Model |
|---|---|---|---|
| Family of 4 | Weekend trip | 11-14 cu ft | Thule Force Sport/Medium |
| Family of 4 | Week-long vacation | 14-16 cu ft | Thule Motion XT L, Yakima CBX 16 |
| Family of 5-6 | Week-long vacation | 16-18 cu ft | Thule Force XL, Yakima SkyBox NX18 |
| Family of 7 | Extended trip + gear | 18-22 cu ft | Thule Motion XT XXL, Yakima SkyBox NXXL |
*Based on typical luggage volumes and cargo box capacities *
FAQ: Kia Carnival Roof Cargo Boxes
1. What’s the weight limit for my Carnival’s roof?
While parked, the roof can support up to 880 lbs (400 kg) distributed evenly. While driving, the maximum load (including the cargo box itself) is 220 lbs (100 kg) .
2. Do I need crossbars, or can I mount directly to the roof rails?
You need crossbars. The cargo box mounts to crossbars, which attach to your roof rails .
3. Will a cargo box affect my fuel economy?
Yes, but the effect varies by box design. Aerodynamic boxes like the Thule Motion XT minimize the impact . Expect a 1-3 MPG reduction at highway speeds.
4. Can I open my sunroof with a cargo box installed?
No. Kia explicitly warns not to operate the sunroof when carrying cargo on the roof rack .
5. Which brand is easier to install?
Both are excellent. Thule’s PowerClick system is tool-free and integrated. Yakima’s system uses a removable torque tool that stores inside the box. Personal preference plays a role .
6. How do I know if a box will fit my Carnival?
Check the hatch clearance measurement and compare to the box’s dimensions. If possible, visit a specialist retailer who can verify fitment .
7. Are these boxes weatherproof?
Yes, both Thule and Yakima boxes are designed to be weather-resistant with seals that keep out rain and snow .
8. Can I lock my cargo box?
Yes, both brands include locking mechanisms to secure your belongings .
9. What’s the warranty on these boxes?
Thule and Yakima both offer limited lifetime warranties on their cargo boxes. Check specific model documentation for details.
10. Should I buy the Thule or Yakima crossbars?
Either works, but it’s often simpler to match brands (Thule box on Thule bars, Yakima box on Yakima bars) to ensure perfect compatibility.
The Verdict: Which One for Your Carnival?
After comparing all the options, here’s our recommendation.
Choose the Thule Motion XT if:
- You prioritize fuel efficiency and aerodynamics
- You like the idea of a white interior (so much easier to see gear)
- You want the integrated, tool-free PowerClick mounting system
- You prefer sleek, understated styling that blends with the vehicle
Choose the Yakima CBX if:
- Hatch clearance is your primary concern (it’s class-leading)
- You love bold, rugged, angular styling
- You want a completely flat interior floor (no clamps protruding)
- Your adventures take you to places where durable, aggressive looks fit the vibe
For Budget-Conscious Buyers:
- Thule Force offers solid performance at a lower price point
- Yakima SkyBox NX delivers reliable function without breaking the bank
One reviewer summed it up well: “Both Thule and Yakima deliver quality, durability, and convenience. Your choice between sleek functionality or a bold, adventurous aesthetic” .
The Bottom Line
Your Kia Carnival is already the ultimate family hauler. Adding a roof cargo box from Thule or Yakima transforms it into an even more capable road trip machine.
The Thule Motion XT excels at aerodynamics and ease of use, with a brilliant white interior option that makes finding gear at night infinitely easier. The Yakima CBX counters with class-leading hatch clearance and aggressive styling that matches the Carnival’s SUV-inspired looks.
Both will serve your family well. Both will keep your gear dry and secure. Both will free up interior space so passengers can stretch out and enjoy the ride.
The choice comes down to what you value most: the sleek efficiency of Thule, or the bold practicality of Yakima.
Kia has moved past just being a value brand. The Carnival proves they are now a design and technology leader. Pair it with a premium cargo box, and you’ve got a road trip setup that rivals any SUV on the market.
Have you added a cargo box to your Carnival? Which brand and size worked for you? Drop your experience in the comments below—we Kia owners learn from each other!
References:
- Kia Carnival Owners Manual – Roof Rack Specifications
- Kia Official – Roof Rack Load Limits and Safety
- Rack Attack – Thule vs Yakima Roof Box Comparison 2025
- Thule vs Yakima Storage Capacity Comparison
- RoofBox Hub – Thule vs Yakima Differences
- The Haulers Club – Best Cargo Box for Car Roof 2026
- Thebookdata – Kia Carnival Roof Rail Installation Guide
