We researched and compared the most popular cargo boxes for the Subaru Outback, analyzing manufacturer specifications, published safety standards (like FMVSS and TUV certification), and aggregated owner feedback from forums and verified reviews. Our evaluation focuses on fit, durability, security, and ease of use for Outback owners. Below are our top picks, each with honest strengths and limitations.
| Photo | Product | Score | Buy |
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Thule Motion XT XXL Best Overall 22 cu ft, 165 lb capacity, 91.5 x 36 x 17.5 in, TUV certified |
9.0 | 🛒 Check Price |
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Yakima SkyBox 21 Carbonite Runner Up 21 cu ft, 165 lb capacity, 92 x 34 x 17 in, SKS locks included |
8.7 | 🛒 Check Price |
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Thule Force XT XL Best Value 18 cu ft, 110 lb capacity, 84.5 x 34 x 16.5 in, TUV approved |
8.4 | 🛒 Check Price |
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Yakima GrandTour 16 Best Compact Option 16 cu ft, 100 lb capacity, 81 x 30 x 16 in, SKS locks |
8.1 | 🛒 Check Price |
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INNO Wedge 660 Best Aerodynamic Design 13 cu ft, 75 lb capacity, 66 x 33 x 15 in, TUV certified |
7.8 | 🛒 Check Price |
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SportRack Vista XL Budget Friendly 18 cu ft, 110 lb capacity, 86.5 x 34.5 x 17 in, no locks included |
7.5 | 🛒 Check Price |
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Rola 59004 Vortex Multi-purpose Mounting 15 cu ft, 75 lb capacity, 63 x 34 x 17 in, includes locks |
7.2 | 🛒 Check Price |
1. Thule Motion XT XXL: Best Overall
The Thule Motion XT XXL is a top-tier cargo box that we found consistently praised in owner forums for its durable construction and thoughtful design. It fits the Subaru Outback’s factory crossbars securely with the PowerClic system, and the dual-side opening is a real convenience when loading gear from either side of the vehicle. The aerodynamic shape helps minimize fuel economy impact, a common concern among Outback owners.
However, this box comes at a significant investment. While the quality justifies the cost for frequent travelers, budget-conscious buyers might find better value elsewhere. Also, its XXL size can be overkill for shorter trips or those with limited roof access. We recommend this for Outback owners who prioritize premium features and have a larger budget.
- Dual-side opening for easy access from either side of the Outback
- PowerClic mounting system provides a secure, tool-free fit to factory crossbars
- Aerodynamic design reduces wind noise and drag at highway speeds
Pros: Excellent build quality and weather sealing; Slim design complements Outback's lines
Cons: Premium price point may not suit all budgets
2. Yakima SkyBox 21 Carbonite: Runner Up
The Yakima SkyBox 21 Carbonite is a close competitor to the Thule Motion XT, offering a similar capacity and weight limit. Our research indicates it is slightly easier to mount due to the QuickMount system, and owners appreciate the integrated SKS locks that keep contents secure. The composite shell is both durable and relatively light, making it easier to lift onto the Outback’s roof.
That said, the interior is not as tall as some rivals, so bulky items like large coolers may not fit as well. Also, the glossy finish shows scratches more readily. We recommend this box for Outback owners who value security and ease of installation over maximum interior space.
- HD Core construction with a rigid, lightweight composite shell
- Tool-free QuickMount system fits most Subaru Outback crossbars
- Integrated SKS locks secure the box to the roof and lock the lid
Pros: Excellent security with integrated locking system; Lightweight for easier handling when mounting
Cons: Interior shape can be awkward for tall items
3. Thule Force XT XL: Best Value
The Thule Force XT XL offers many of the same features as the Motion XT but at a more accessible price point. In our evaluation, it is a solid choice for Outback owners who need a reliable box without the premium cost. The dual-side opening is a plus, and the SlideLock system makes mounting straightforward. Its narrower width fits well on Outback crossbars that are closer together.
However, the weight capacity is lower (110 lb) compared to larger boxes, so it is not ideal for very heavy cargo like multiple suitcases. Also, the interior length is shorter, which may not accommodate long skis or boards. We recommend this for Outback owners who want a quality box for lighter, shorter trips.
- Dual-side opening for convenient access from either side
- SlideLock system provides secure attachment and easy one-handed adjustment
- Slightly narrower profile fits Outback with crossbars closer together
Pros: Great balance of price and features; Compact size suitable for shorter Outback roof
Cons: Lower weight capacity limits heavy gear
4. Yakima GrandTour 16: Best Compact Option
The Yakima GrandTour 16 is a compact cargo box that we found well-suited for Outback owners who need occasional extra space without the bulk of a large box. Its smaller footprint makes it easy to mount and remove, and it is less likely to interfere with garage clearance. Owners report good wind noise performance, and the SKS locks provide added security.
That said, the 16 cu ft capacity is best for small loads like a couple of duffel bags or camping gear for two. If you frequently carry skis or large suitcases, this box may feel cramped. We recommend it for solo travelers or couples with modest cargo needs.
- Compact size is easy to store when not in use
- Aerodynamic shape reduces wind resistance on the Outback
- SKS locking system secures the box and contents
Pros: Lightweight and easy to handle; Ideal for daily driving with minimal roof impact
Cons: Limited capacity for large families or long trips
5. INNO Wedge 660: Best Aerodynamic Design
The INNO Wedge 660 is designed with aerodynamics as a priority. Our research shows it produces less wind noise than many competitors, and its low profile allows for better sunroof visibility on the Outback. The quick-release mounting is easy to use, and the dual-side opening adds convenience. It is a good choice for those who prioritize fuel economy and quiet driving.
However, the capacity is modest at 13 cu ft and the weight limit is only 75 lb, making it unsuitable for heavy or bulky cargo. Some owners also note that the plastic feels less strong than Thule or Yakima models. We recommend this for Outback owners who primarily need a box for light, aerodynamic-friendly items like clothing or camping gear.
- Low-profile wedge shape minimizes wind drag and noise
- Quick-release mounting system fits most crossbars
- Dual-side opening for convenient loading
Pros: Excellent aerodynamic performance on the Outback; Compact design fits even with sunroof clearance
Cons: Limited capacity and weight rating
6. SportRack Vista XL: Budget Friendly
The SportRack Vista XL is a budget-oriented cargo box that offers generous 18 cu ft capacity for a fraction of the cost of premium brands. In our evaluation, it is a viable option for Outback owners who need extra space occasionally and are willing to compromise on some features. The universal mounting works with factory crossbars, and the weather seal does a decent job keeping contents dry.
However, the lack of included locks is a notable downside, and the plastic shell feels less durable than higher-priced options. Some owners report wind noise at highway speeds. We recommend this box for cost-conscious buyers who understand its limitations and are willing to add aftermarket locks.
- Large capacity at an affordable price point
- Universal mounting system fits most crossbars including Subaru factory bars
- Semi-rigid shell with weather-resistant seal
Pros: Very budget-friendly for the size; Spacious interior for the price
Cons: Locks not included; must purchase separately; Build quality and finish are less refined
7. Rola 59004 Vortex: Flexible Mounting
The Rola 59004 Vortex is a compact cargo box that offers a good balance of features at a moderate price. Our research shows it fits the Subaru Outback’s crossbars well, and the included locks are a plus. The vortex design helps reduce wind noise, and the integrated locking system secures the box to the roof. Owners generally appreciate the value for the price.
However, the capacity is limited to 15 cu ft and the weight limit is only 75 lb, so it is best for light loads. Some users report that the mounting system can be tricky to align properly. We recommend this box for Outback owners who need a small, secure box for occasional use and are comfortable with a slightly fussy installation.
- Compact size with integrated locking system
- Aerodynamic vortex design reduces drag
- Fits both factory and aftermarket crossbars
Pros: Good build quality for the price; Includes locks for security
Cons: Small capacity and low weight limit; Mounting hardware can be finicky
Frequently Asked Questions
Will a cargo box fit on my Subaru Outback with factory crossbars?
Yes, most cargo boxes are designed to fit factory crossbars. However, you should check the box’s mounting system compatibility and the crossbar spread on your Outback. Many boxes like the Thule Motion XT and Yakima SkyBox include universal brackets that work with factory aero bars. Always measure your crossbar spacing and compare with the box’s recommended fit range.
How much weight can I safely put on my Outback's roof with a cargo box?
The Subaru Outback’s roof load capacity is typically around 165 lb (including the weight of the cargo box). The box itself weighs between 30-50 lb, so you should subtract that from the total. For example, a 40 lb box leaves about 125 lb for cargo. Always consult your owner’s manual and the cargo box’s weight rating to stay within safe limits.
Will a cargo box affect fuel economy on my Outback?
Yes, any roof-mounted cargo box will increase aerodynamic drag and reduce fuel economy, typically by 5-15% at highway speeds. Aerodynamic boxes like the INNO Wedge 660 and Thule Motion XT minimize this impact. Removing the box when not in use is the best way to maintain fuel efficiency.
Can I open my Outback's rear hatch with a cargo box installed?
In most cases, yes, as long as the box is mounted far enough forward. The Outback’s rear hatch opens upward and backward, so a box mounted too far back may interfere. We recommend positioning the box so it does not extend past the rear of the roof rack crossbars. Test the hatch clearance before fully loading the box.
Do I need locks for my cargo box?
Locks are highly recommended to secure both the box to the roof and the lid. Many boxes come with integrated locks (e.g., Yakima SKS, Thule PowerClic). If not, you can purchase aftermarket locks. Locks prevent theft of the box and its contents, and some insurance policies may require them for coverage.
Our Verdict
After comparing specifications, safety certifications, and owner feedback, our top pick for the Subaru Outback is the Thule Motion XT XXL for its outstanding build quality, dual-side opening, and secure fit. For a slightly more budget-friendly option that still offers premium features, the Yakima SkyBox 21 Carbonite is an excellent runner-up. Both provide reliable performance for Outback owners seeking extra cargo capacity.
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