The Thule Force 3 XL ($930) is the all-rounder in Thule’s roof box lineup, combining modern design with excellent everyday usability. Its sliding latch, dual-sided access, and wide opening make loading and unloading gear especially easy, and the 18-cubic-foot XL size is a great fit for families or groups hauling skis, camping gear, and luggage. The interior floor isn’t perfectly flat due to the mounting hardware, and it’s a little pricier than some competitors. Still, the Force 3 stands out for its intuitive operation, build quality, and overall versatility as a do-it-all cargo box.
Gear Capacity
Ease of Access
Durability & Quality
Installation
Features
Sustainability
Capacity
18 cu. ft.
Dimensions
84.8 x 34.1 x 16.9 in
Access
Dual side
Opening height
14.5 in.
Max ski length
200 cm
Weight
49 lb.
Other Capacities
11, 14, 16, 21 cu. ft.
Pros
Cons
Thule Force 3 XL
For this season's top models, see our guide to the Best Roof Boxes.
Thule offers the Force 3 in a wide range of sizes—from the compact L Sport (11 cu. ft.) to the massive XXL (21 cu. ft.)—but the XL version I tested strikes arguably the most practical balance. With 18 cubic feet of capacity, it’s large enough for family trips while still fitting well on most vehicles. In use, it easily swallowed bulky camping gear for my family of four, including a six-person tent, large sleeping mats, two camp chairs, and several sleeping bags. Ski storage is another highlight: the Thule Force 3 XL accommodates skis up to 200 centimeters, which is slightly longer than its primary competitor, Yakima’s SkyBox NX XL, and long enough for most alpine setups and even many Nordic skis.
Interior shaping maximizes usable volume. The floor dips slightly at the front, middle, and rear, creating extra vertical clearance for bulky gear. The central dip is particularly useful for accommodating ski bindings and helps prevent skis from rotating excessively during transport. A blunt front nose and relatively tall midsection further boost usable space, allowing the box to swallow an impressive amount of gear. The rear does taper a bit more than the SkyBox NX XL, although in practice, the two boxes carry very similar loads given their nearly identical capacities.
There are a couple of small tradeoffs with the Force’s design. The four mounting hardware pieces that connect the box to your vehicle’s crossbars protrude into the interior about 2.5 inches and include semi-bulky twist dials, which means the floor isn’t perfectly flat. This was most noticeable when loading items I hoped to slide into place, like rolling luggage or a duffel. Additionally, the front stiffening bar sits inside the hinge and runs straight across the box rather than following the angled nose. It’s a minor detail, but Yakima’s design places the bar outside the hinge and preserves slightly more usable space at the front. On the plus side, Thule includes tie-down straps that thread through six interior metal loops, making it easy to secure skis and other gear.
Ease of access is one of the Force 3 XL’s biggest strengths. Like most mid- to high-end roof cargo boxes, it features dual-sided openings that allow you to load or unload gear from either side of the vehicle. Thule’s updated Force 3 design—replacing the prior Force XT—now uses our favorite locking mechanism in the category, which was previously only featured on the top-end Motion 3. After turning the key, you simply pinch the sliding latch to pop the lid open. The system is extremely intuitive and requires very little effort to operate, and in practice, it’s noticeably easier to use than the handle-style latch on boxes like the Yakima SkyBox NX, which requires a firmer push to disengage.
Another advantage is the size of the opening itself. The Force 3 measures about 14.5 inches tall when opened—roughly 2 inches larger than the Yakima SkyBox NX—and that extra clearance is noticeable when loading bulky items like stuffed duffels or rigid suitcases. The opening also runs the full length of the box, making it easy to slide gear into the front or rear without awkward maneuvering. Taken together, the wide opening and extremely user-friendly latch make the Force 3 one of the easiest roof boxes to load and unload, matching the even pricier Thule Motion 3 in day-to-day usability.
While it lacks the glossy automotive-style finish of Thule’s premium Motion 3, the Force 3 XL is clearly a well-made product. The thick plastic shell feels sturdy and confidence-inspiring, and the textured finish (Thule calls it AeroSkin) does an excellent job hiding small scratches that inevitably accumulate with use—something the Motion’s glossy surface is more prone to showing. The matte look is also fairly understated on the roof: it’s practical rather than super-sleek, which I lean towards, though that’s a very subjective take. The locking system is another highlight from a durability standpoint. The pinch-and-slide latch operates smoothly and avoids putting unnecessary stress on the key or handle, which gives me confidence in its long-term reliability.
One small caveat is the mounting hardware, which is removable rather than permanently integrated into the box. Each clamp snaps in and out of place in the four corners, which is convenient if you want a flatter surface for storage when the box is off the car. However, the plastic tabs that hold the mounts in place aren’t especially thick, so I’d be cautious about repeatedly removing and reinstalling them over time. In practice, I left the clamps installed and have had no issues.
Weather protection and structural integrity both inspire confidence. The lid overlaps the base all the way around the box and there are no exposed holes that could allow water intrusion. In testing—including driving through classic Pacific Northwest snowstorms over multiple mountain passes—the interior has remained fully dry. Internally, a front stiffening bar and metal reinforcement rails along the sides add rigidity to the shell, minimizing movement at highway speeds and in windy conditions. At $930, the Force 3 costs about $80 more than the comparable Yakima SkyBox NX XL and doesn’t offer a dramatic performance advantage beyond its excellent latch design. Even so, the build quality is undeniable and it remains a roof box we’d confidently recommend (for a deeper dive into how Thule and Yakima stack up, see our article comparing the two brands).
Modern roof cargo boxes have greatly improved ease of setup and installation, and that’s true of the latest Thule Force 3 XL. It’s a two-person process to load the 50-pound box on a roof, but after that, it’s impressively simple. The mounting hardware slides smoothly forward and backward to accommodate a wide range of crossbar spreads—Thule lists compatibility from 21 ⅞ to 36 ⅝ inches. In testing on vehicles with 27- and 30-inch spreads, positioning the clamps was quick and straightforward. The clamps themselves are also highly versatile, tightening securely around a variety of bar shapes, including aero bars (I tested with Thule AeroBlade Edges), slim factory designs, and square crossbars.
Unlike the standalone torque tool used by Yakima’s SkyBox, each clamp on the Force 3 has its own integrated tightening dial. The knobs are easy to turn and torque-limited, clicking audibly when properly secured (you want to hear three clicks). Just make sure the clamps are centered over the bars so they tighten evenly. It’s an extremely user-friendly design and a noticeable improvement over older systems—such as Yakima’s RocketBox hardware, which could feel sticky and difficult to slide—or more budget designs like the Sportrack, which rely on separate metal clamps and bolts that are slower and more tedious to install.
The Force 3’s feature set is commensurate with its premium price tag. The standout is Thule’s updated locking system, which is one of the most user-friendly designs on the market. The pinch-and-slide latch requires very little effort to operate, comes with two included keys, and incorporates a red indicator that shows when the box isn’t fully secured. In addition, the key won’t release until the lid is properly closed. Three latch points run along the side of the box and all must engage before the indicator disappears. In practice, this system works well but can be a little finicky if the box is packed full. In those cases, I occasionally had to press down at each latch point to get everything to fully engage. We’ve noticed the same quirk on the Thule Motion 3, which uses a similar system. Notably, it was less of a challenge to get the Yakima SkyBox’s latches fully secured.
Beyond the locking mechanism, Thule integrates several thoughtful touches into the design. A molded shelf along the lid makes it easy to press the box closed from either side, and the Force 3 includes a few sets of straps for securing gear. Six metal loops along the interior make it simple to thread the straps through and snug down items like skis. Finally, there are also hanging pull-down straps inside the lid, which are helpful for closing the box if it sits high on your vehicle and is difficult to reach from the ground.
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Longevity
Choosing durable outdoor gear and keeping it in use for longer is one of the best ways to reduce environmental impact. Our proprietary longevity rating assesses factors like overall build quality, materials, fabric denier, component durability, and real-world performance. A green check indicates that we expect the product to be long-lasting relative to its peers, a yellow check mark indicates average longevity, and a red X indicates a product that may have a limited lifespan.
Recycled Materials
Recycled materials are prevalent in outdoor gear, with nylon, polyester, wool, and down among the most common, but the composition varies widely. A green check mark indicates the product is made with a substantial amount of recycled materials (100% recycled or the core fabric that makes up most of the product is recycled), a yellow check means it contains a moderate to small amount of recycled materials, while a red X means there are no recycled materials in the product.
Replacement Parts
Replacement parts help extend a product’s lifespan by allowing consumers to repair damaged components—like ski goggle lenses or trekking pole clips—rather than purchasing a new one. A green check indicates a brand offers a robust selection of replacement parts, a yellow check indicates a more limited offering, and a red X indicates no replacement parts are available for this product.
Responsible Manufacturing
This criterion evaluates a brand’s commitment to fair wages, safe working conditions, and reducing environmental impact through certifications and programs like Fair Trade Certified, Fair Wear Foundation, Worldwide Responsible Accredited Production (WRAP), and the Fair Labor Association, while also recognizing brands that manufacture primarily in the U.S. or Europe under strict labor and environmental regulations. A green check mark indicates a brand meets our responsible manufacturing criteria, while a red X means it does not.
Recycled and/or Reduced Packaging
Packaging can add significant waste to outdoor gear purchases, so many brands work to reduce its impact by using recycled materials, incorporating Forest Stewardship Council-certified paper products, and minimizing plastic and paper use. A green check mark indicates a brand uses recycled or reduced materials across all of its packaging, a yellow check indicates moderate or limited use of recycled or reduced packaging, and a red X indicates the brand does not make either of these efforts.
Carbon Footprint Tracking
This criterion evaluates whether a brand measures, reports, and works to reduce its greenhouse gas emissions using established frameworks such as the Higg Index, Greenhouse Gas Protocol, or The Change Climate Project. A green check mark indicates a brand publicly reports greenhouse gas emissions data, sets clearly defined reduction targets, and uses established tracking frameworks such as Higg or The Change Climate Project. A yellow check mark indicates the brand tracks emissions and outlines reduction goals but provides limited data, lacks science-based verification, or does not clearly report progress. A red X indicates the brand does not appear to track greenhouse gas emissions or provides so little information that its efforts cannot be verified.
Annual Impact Report
Annual impact reports provide transparency and accountability by outlining a brand’s sustainability efforts across areas such as material sourcing, greenhouse gas emissions, waste, water use, supply chains, and packaging. A green check mark indicates a brand publishes a detailed, brand-specific impact report that closely aligns with our sustainability criteria and leaves little room for ambiguity. A yellow check indicates a brand provides some relevant sustainability reporting but lacks detail in key areas or is covered only briefly within a parent company report. A red X indicates a brand does not regularly publish an impact report.
The Thule Force 3 XL is designed to work with nearly any crossbar setup. The adjustable clamps slide easily and accommodate a wide range of crossbar spreads—from 21 ⅞ to 36 ⅝ inches—while securely fitting most bar shapes, including aero, square, round, and factory crossbars. In testing, the system mounted easily on several bar types and proved highly adaptable across different vehicles.
One factor to consider is hatch clearance. The Force 3 XL is slightly longer than the Yakima SkyBox NX XL and offers a slightly narrower adjustment range, which can create tighter fit situations on smaller vehicles. Hatch clearance requires measuring the distance from the front crossbar to the closest point on the open hatch. Thule lists a minimum measurement of 53 ⅙ inches for the Force 3 XL. My Volkswagen Golf Alltrack measured 54 inches, which technically worked, but required pushing the box as far forward on the bars as possible and still left very little margin. By comparison, the SkyBox NX XL requires only 50 inches and fit more comfortably on the same vehicle.
For most midsize-to-large vehicles, however, fit should be straightforward. On a Jeep Grand Cherokee L that I also tested, hatch clearance was no issue and the overall proportions of the box looked far more balanced. On the smaller Volkswagen, the box functioned fine but visually appeared quite large, reinforcing that the Force 3 XL is best matched with medium to larger SUVs and wagons.
Yakima SkyBox NX XL ($849): “Value” Play
The Force and Yakima SkyBox NX are close competitors in nearly every respect. The XL versions of both offer nearly identical capacities and similar feature sets, including dual-sided access, durable textured exteriors, and user-friendly installation. The Force’s sliding locking mechanism is easier to operate than the SkyBox’s stiffer handle, while the SkyBox counters with a flatter interior floor that makes loading gear slightly easier. The Force also has a small edge in length, accommodating skis up to 200 centimeters compared with the SkyBox’s 195. Otherwise, there’s very little separating the two, which is why the more affordable SkyBox gets the nod from us. For more, read our review of the SkyBox NX XL.
Thule Motion 3 XL ($1,150): Premium Looks, Similar Performance
Thule’s Motion 3 XL sits above the Force 3 in the brand’s lineup, but the two boxes share more similarities than differences. Both offer nearly identical capacities, the same 200-centimeter maximum ski length, Thule’s excellent SlideLock system, and a very similar interior layout and mounting hardware. What you gain with the Motion is primarily aesthetic: a glossy automotive-style paint finish and slightly sleeker, more sculpted shape that gives it a more premium look on the roof. In day-to-day use, however, the experience between the two is remarkably similar. Unless the polished finish and slightly more upscale appearance are priorities, the Force 3 delivers much of the Motion’s functionality for about $200 less. For more, read our review of the Thule Motion 3 XL.
An impressive roof box that barely missed out on our top overall spot, the Force 3 features an easy-to-use sliding latch system and a wide opening for easy access to your gear. Its drawbacks include a high price and a bulky mounting system, which slightly pinches interior space.
Gear Capacity
Ease of Access
Durability & Quality
Installation
Features
Sustainability
A true all-rounder, the SkyBox NX XL hits the mark with its quality, durable construction, versatile capacity, and ease of use. It can be hard to call such an expensive product a good value, but the SkyBox is just that, undercutting the price of its main competition.
Gear Capacity
Ease of Access
Durability & Quality
Installation
Features
Sustainability
With an aerodynamic shape and a glossy paint job, the sleek Thule Motion 3 is a premium roof box through and through. Its cost is hard to swallow, but the polished design is quite functional, with user-friendly features and generous interior space for ski, camp, and travel gear.
Gear Capacity
Ease of Access
Durability & Quality
Installation
Features
Sustainability
The Thule Force 3 XL is a great match for folks who frequently haul bulky gear for camping trips, ski days, or road travel. The spacious interior, ability to accommodate skis up to 200 centimeters, and wide dual-sided opening make it especially easy to load and access gear. Its intuitive sliding latch and large opening also make everyday use simpler than many competing boxes. The interior floor isn’t perfectly flat due to the mounting hardware, and the price is on the high side, but if you prioritize ease of use and a well-built, versatile cargo box, the Force 3 XL is a very strong option.
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