#1 on this list
Motion 3 XL
Thule
The Thule Motion 3 XL stands out across independent testing as the benchmark for high-capacity, premium rooftop storage. Designed for families, road-trippers, and winter sports enthusiasts who routinely travel with heavy loads, this box prioritizes user-friendly operation and structural rigidity. Independent reviews consistently praise the updated lid stiffness, which minimizes the frustrating flex often found when opening and closing large, plastic roof boxes in windy weather. Mounting the Motion 3 XL relies on Thule's PowerClick quick-mount system, which features an integrated torque indicator that clicks audibly when properly clamped down. This design significantly simplifies installation, allowing a single person to secure or adjust the box along crossbars without hunting for separate hand tools. Dual-sided opening ensures straightforward access to gear from either curb or road side, while the low-drag exterior shaping helps mitigate cabin wind noise and harsh drops in fuel economy at highway speeds. The main drawback is the substantial financial investment. Listed around $1,150, the Motion 3 XL commands a steep premium over workhorse alternatives. Its overall length and forward-mounted profile require careful positioning to avoid contact with open rear hatches on smaller wagons or compact crossovers. However, for drivers seeking refined ergonomics, robust hardware, and reliable weatherproofing, it remains the most well-rounded high-capacity carrier on the market. **Highlights** - PowerClick torque-limiting mounting clamps click when tight - Dual-sided opening allows convenient loading from both vehicle sides - Redesigned aerodynamic profile minimizes wind drag and road noise - SlideLock system features separate locking and opening functions - Ample internal volume comfortably fits long skis and bulky camp gear **Watch-outs** - High retail price represents a significant upfront cost - Extended footprint may challenge rear hatch clearance on smaller cars - Total empty weight requires care during one-person rooftop lifting
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#2 on this list
Skybox NX
Yakima
The Yakima Skybox NX represents a modern refresh of Yakima's long-running flagship line, balancing full-size utility against a price point lower than top-tier rivals. Built for outdoor multi-sport users who need consistent all-season gear transport, the NX introduces upgraded mounting clamps and a more angular, contemporary aesthetic. Evaluators widely view it as a direct competitor to high-end European models, offering comparable interior utility with rugged, durable plastic construction. One of the most notable upgrades on the NX series is the revamped mounting hardware. Yakima switched to low-profile, clamp-style mounts that sit flatter against crossbars and take up less usable floor space inside the cargo compartment. Dual-sided access makes packing duffels and tensioning straps straightforward. The latch handle is positive and tactile, giving clear feedback when the lid is properly seated and ready to lock, eliminating guesswork before pulling out onto the highway. While the Skybox NX delivers excellent overall functionality, reviewers note that the plastic lid exhibits slightly more torsional flex than premium competitors like the Motion 3 when opening in brisk crosswinds. At around 47 to 53 pounds depending on size configuration, it is reasonably manageable to hoist, but its bulk makes two-person mounting much safer. It delivers roughly 90 percent of top-tier performance at a noticeable cost savings. **Highlights** - Low-profile interior mounting clamps preserve flat storage space - Dual-side opening offers balanced access across wide vehicles - Sturdy locking handle clearly indicates when latches are secured - Robust outer shell resists cosmetic scratching and road wear - Versatile crossbar compatibility fits round, square, and aero bars **Watch-outs** - Lid demonstrates moderate plastic flex during single-handed operation - Overall height can impact clearance in low-clearance residential garages - Bulky physical footprint makes solo roof placement challenging
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Specs side by side
| Spec | Motion 3 XL | Skybox NX |
|---|---|---|
| Manufacturer | Thule | — |
| Model | Motion 3 XL | — |
| Category | Rooftop Cargo Box | — |
| Approximate Price | Around $1,150 | $850 |
| Mounting System | PowerClick Quick-Mount | Low-profile clamp hardware |
| Opening Style | Dual-Sided Opening | — |
| Volume Options | — | 16 and 18 cubic feet |
| Empty Weight | — | 47 to 53 lbs depending on size |
| Opening Mechanism | — | Dual-sided with tactile latch handle |
| Crossbar Fit | — | Aero, round, square, and factory crossbars |
What our reviewers liked and didn't
Motion 3 XL
- PowerClick mounting hardware audibly clicks when proper torque is reached
- Dual-sided access allows convenient loading from either side of the vehicle
- Stiffened lid architecture prevents binding during opening and closing
- SlideLock system provides clear visual confirmation of secure latching
- Steep retail price commands a significant premium over entry-level options
- Long footprint requires careful placement to clear rear liftgates on compact cars
- Substantial physical dimensions make solo off-vehicle storage challenging
Skybox NX
- Low-profile floor clamps maximize flat interior packing space
- Dual-sided access eases gear loading and clamp adjustment
- Tactile latch handle clearly confirms secure lid closure
- Competitive price delivers premium utility below four figures
- Durable textured shell resists scratches and highway debris
- Lid shows noticeable torsional flex when open in stiff winds
- Bulk and weight make two-person roof installation advisable
- Tall profile requires careful garage and overhang clearance checks
Prices change constantly — the figure shown is the last verified catalog price, and the buy buttons always go to the current listing.