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If you need more cargo space on your Scion xB, a rooftop cargo box can free up interior room and keep bulky items secure. Picking the right box matters because it affects how much you can carry, how the vehicle handles, and how easy the box is to install and use. This guide covers five shortlisted rooftop cargo boxes chosen for their balance of capacity, mounting compatibility, durability, and handling. We evaluated each option on storage volume and ease of installation so you can quickly find the best fit for your Scion xB. Read on for the key considerations before the product list.
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Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | Goplus 14 cu ft Hard-Shell Rooftop Cargo Box |  |
| Best Quality Built to a higher standard if you want something more solid | VISRACK W58 Hard-Shell Roof Cargo Box, 15.5 cu ft, Dual-Side Opening |  |
| Best Budget The cheapest option that still gets the job done reliably | Yakima SkyBox NX 18 Roof-Top Cargo Box |  |
| Most Sold A high-volume bestseller chosen again and again | GarveeTech 14 cu ft Hard-Shell Rooftop Cargo Box, Dual-Side Opening |  |
| Best Overall The best all-around choice for most situations | Perflex Exclusive Large Rooftop Cargo Box — 17.7 cu ft, Dual-Side Opening |  |
1. Goplus 14 cu ft Hard-Shell Rooftop Cargo Box
| Volume | 14 Cubic Feet |
|---|---|
| Mounting Type | Roof Mount |
| Water Resistance Level | Waterproof |
| Load Capacity | 165 lbs |
| Shell Type | Hard |
The Goplus 14 cu ft hard-shell rooftop cargo box gives Scion xB owners a lightweight, weatherproof way to expand cargo capacity without sacrificing passenger space. It mounts to factory or aftermarket crossbars using four quick-connect anchors and fits crossbars 17 to 22.8 inches wide. The dual-side opening and double-lock design make loading and unloading on either side of the vehicle convenient, and ABS/PC construction plus metal lid stiffeners help the box stand up to rain and road use. In practice this box is easy for one person to lift onto the roof and install, and its aerodynamic shape keeps wind noise and fuel penalty modest compared with bulkier carriers. Important limitations are a relatively thin lid and plastic lock components that some users have found less robust than metal alternatives, and the internal tie-down options are minimal so you must secure loose items yourself. Customer-service responsiveness has also been reported as inconsistent when keys or parts are needed.
Best for: Reliability-minded buyers who prioritize practical, easy-to-install storage for regular road trips and errands on a Scion xB and want a weatherproof, aerodynamic solution without a premium price.
Less Ideal for: Users seeking the strongest theft resistance or the most heavy-duty construction should consider higher-end metal-reinforced boxes with metal locks and more internal tie-down options.
- Lightweight design makes it possible for one person to mount and remove on a Scion xB
- Waterproof ABS/PC shell with metal lid stiffeners protects gear from the elements
- Dual-side opening improves access from either side of the vehicle
- Aerodynamic profile reduces drag and road noise compared with boxier carriers
- Top lid is relatively thin and feels less impact-resistant than premium boxes
- Locking hardware uses plastic components that may not be as durable as metal locks
- Limited internal anchor points require you to secure cargo separately to prevent shifting
Verdict A practical, easy-to-install waterproof cargo box that expands a Scion xB's storage with good aerodynamics but with modest lock and lid robustness compared with premium models.
2. VISRACK W58 Hard-Shell Roof Cargo Box, 15.5 cu ft, Dual-Side Opening
| Water Resistance Level | Waterproof |
|---|---|
| Mounting Type | Roof Mount |
| Item Volume | 15.5 Cubic Feet |
| Shell Type | Hard |
| Automotive Fit Type | Universal Fit |
The VISRACK W58 is a hard-shell rooftop cargo box designed to add substantial, weatherproof carry capacity to a vehicle with roof crossbars. It mounts to standard crossbars and is typically used for road trips, bike transport after partial disassembly, or moving bulky soft luggage that would otherwise crowd the cabin. The shell is made from ABS/PMMA, offers a 15.5 cubic-foot interior and a factory-style locking system with keys so the lid stays closed in motion and cannot be removed until locked. Dual-side opening simplifies loading from either side of the car and speeds access at rest stops. Practical benefits include strong water resistance in heavy rain, easy tool-free installation hardware included in the package, and a shape that remains aerodynamic to limit MPG loss on highway runs. Important limitations are the 130 lb load guideline which constrains very heavy cargo and the somewhat shorter length that may require rotating or partially disassembling long items like bikes to fit. The included mounting hardware uses U-bolt style clamps that are secure but take more fiddling than premium quick-release systems.
Best for: Performance-oriented buyers who prioritize carrying capacity and secure, weatherproof transport for long road trips or weekend adventures on a Scion xB while keeping aerodynamic efficiency in mind.
Less Ideal for: Buyers who need to routinely carry extremely heavy loads, oversized items longer than the box length, or who prefer an ultra-fast hatch-style quick-release mounting system should consider different solutions.
- Waterproof hard-shell construction keeps gear dry in heavy rain.
- Dual-side opening for easier loading and passenger-side access.
- Factory-style keyed lock provides closed-lid security while traveling.
- Generous 15.5 cubic-foot interior expands cargo capacity without sacrificing cabin space.
- 130 lb suggested load limit limits heavy equipment hauling.
- Mounting uses U-bolt style clamps that require more time to install than quick-release systems.
Verdict A weatherproof, aerodynamic 15.5 cu ft hard-shell box for Scion xB owners who want secure, road-ready extra cargo space without a large MPG penalty.
3. Yakima SkyBox NX 18 Roof-Top Cargo Box
| Volume | 18 Cubic Feet |
|---|---|
| Mounting Type | Roof Mount |
| Shell Type | Hard |
| Water Resistance Level | Not Water Resistant |
The Yakima SkyBox NX 18 is a hard-shell roof cargo carrier designed to add significant storage when your Scion xB is short on space. It mounts to factory-style crossbars and gives 18 cubic feet of usable volume, letting you stow suitcases, skis or camping gear off the cabin floor. Dual-sided opening makes loading easier from either side of the vehicle, and the full-metal handle with integrated SKS locks secures the lid and locks the box to the bars. The flattened internal floor makes packing awkward-shaped items simpler and the NX nano-texture on lid and base helps keep the surface tidy. Expect a two-person lift during installation due to the box length, and take care measuring fore-aft fit so the rear hatch can open on the Scion xB. The lid can feel a bit flexible when fully loaded and the carrier is not rated as water resistant, so heavy prolonged exposure to rain may merit extra packing protection. For drivers who need a capacious, secure rooftop box that mounts to crossbars, this is a sensible, premium-feeling option matched to budget-minded tradeoffs.
Best for: Budget-conscious Scion xB owners who prioritize adding substantial, secure rooftop storage for road trips and outdoor gear without sacrificing a factory-quality mount and features.
Less Ideal for: Drivers who need a fully waterproof solution for prolonged wet conditions or those who cannot accommodate a long box on their vehicle without blocking the rear hatch.
- Large 18 cu ft capacity frees interior space on long trips.
- Dual-sided opening simplifies loading from either side of the Scion xB.
- Integrated SKS locking handle secures gear and deters theft.
- Flattened internal floor maximizes usable space for awkward items.
- Not water resistant so very heavy rain could allow moisture ingress.
- Long, bulky shape requires two people to lift and careful fore-aft placement to avoid blocking the hatch.
Verdict If you need a roomy, easy-access rooftop box for a Scion xB at a reasonable value, the SkyBox NX 18 delivers strong storage and security but watch hatch clearance and wet-weather exposure.
4. GarveeTech 14 cu ft Hard-Shell Rooftop Cargo Box, Dual-Side Opening
| Water Resistance Level | Waterproof |
|---|---|
| Mounting Type | Roof Mount |
| Shell Type | Hard |
| Automotive Fit Type | Universal Fit |
This GarveeTech hard-shell rooftop cargo box is a practical way to add roughly 14 cubic feet of weatherproof storage to a vehicle equipped with roof crossbars. It mounts with four quick-connect anchors and clamps that accept a range of crossbar widths and spacings, and the dual-sided opening makes loading from either side of the car easy. The aerodynamic shape reduces wind noise and helps limit fuel penalty, while included straps and keyed locks provide basic security. Real-world reports show it is lightweight enough for one person to lift and simple to install, and it held up well on long highway trips for many buyers. Limitations to note are occasional quality issues reported with the lock hardware and that cheaper plastics may not match premium-brand fit-and-finish. Also verify your Scion xB crossbar spacing and width fall within the published ranges before buying because fitment depends on your rack. For risk-averse buyers after a budget-friendly, functional cargo box for occasional travel, it delivers strong utility with a few durability caveats.
Best for: A risk-averse mainstream buyer who wants a budget-friendly, functional rooftop box that reliably increases cargo space for occasional road trips and errands while sticking close to factory-style convenience.
Less Ideal for: Do not choose this if you need a lifetime-grade, heavy-duty carrier for daily heavy loads or if you require premium metal lock hardware and finish quality.
- Dual-sided opening for easy access from either side of the vehicle
- Quick-connect anchor system for straightforward installation and removal
- Waterproof hard-shell design that protects cargo from rain and UV
- Aerodynamic shape that reduces wind noise and limits fuel impact
- Lock components reported as lower-grade plastic on some units which may fail
- Quality and fit-and-finish can vary compared with higher-end brands
Verdict A cost-conscious, waterproof hard-shell box that adds substantial extra storage with easy mounting and access but may show occasional quality issues in the locking hardware.
5. Perflex Exclusive Large Rooftop Cargo Box — 17.7 cu ft, Dual-Side Opening
| Item Volume | 500 Liters |
|---|---|
| Shell Type | Hard |
| Mounting Type | Roof Mount |
| Weight Capacity | 130 lbs |
| Exterior | Textured (Matte) finish |
The Perflex Exclusive is a hard-shell rooftop cargo carrier designed to expand a vehicle's storage for road trips, skis, camping gear, and bulky luggage. It mounts to factory-style roof racks or crossbars with a tool-free mounting system and ships fully assembled, so you can install and remove it without special tools. Notable features include a 17.7 cubic foot (500 L) capacity, dual-side opening for easier loading from either side, a central locking system with four keys, and construction from UV- and impact-resistant ABS for weather protection and durability. Practical benefits include extra organized space for gear without crowding the cabin, reduced wind noise thanks to a streamlined profile, and the convenience of being able to load from either side of a Scion xB. Important limitations are its maximum load rating of 130 lbs and the relatively heavy shell which can complicate handling during installation; a few users have reported latch or lock issues that required service or parts replacement. Expect good day-to-day utility for family trips and seasonal gear storage but plan for careful handling when mounting and periodic checks of the locks.
Best for: Balanced all-round buyers who want a reliable, roomy rooftop box for regular family trips and seasonal sports gear while prioritizing versatility and ease of use.
Less Ideal for: Buyers who need to carry very heavy loads above 130 lbs or who frequently add and remove the box solo without assistance should consider lighter or different mounting solutions.
- Large 17.7 cu ft (500 L) capacity fits skis, snowboards and multiple suitcases.
- Dual-side opening makes loading and unloading convenient from either side of the vehicle.
- Central locking system with extra keys adds security and helps keep contents dry.
- Tool-free, universal-style mounting is quick to install and remove on roof racks/crossbars.
- Maximum supported load of 130 lbs limits very heavy cargo.
- Relatively heavy unit can be awkward to lift and align alone during installation.
- Some customers reported latch or lock failures requiring replacement parts or service.
Verdict A roomy, weather-resistant hard-shell box that suits a Scion xB for family trips and sports gear, but pay attention to the 130 lb limit and the unit's weight when mounting.
Choosing the Right Scion xB Rooftop Cargo Box: Key Factors to Consider
Mounting Compatibility
Mounting compatibility determines whether a rooftop cargo box will attach securely to your Scion xB crossbars or raised rails. Confirm the crossbar spacing, shape, and load capacity because many boxes use universal U-bolts or T-track mounts that assume a standard range of bar widths. A mismatch can lead to poor clamping force or require extra adapters.
Mounting ease matters for frequent use. Look for systems that allow tool-free or quick-release attachment to reduce installation time. Also consider whether the box opens on one side or both; side-opening designs can affect how you position the box relative to door clearance during installation.
Capacity and Interior Shape
Storage volume, often expressed in liters, directly impacts how much gear you can carry. Consider both the nominal capacity and the interior shape because tapered or shallow tails reduce usable space for long items. Think about the types of items you usually pack, such as skis, luggage, or camping gear, and choose a shape that accommodates those profiles.
Also account for load distribution. A larger capacity box concentrates more weight on the roof, so ensure the vehicle roof load limit is not exceeded. Choosing a box with well-organized interior space helps maximize usable volume without unnecessary shifting during transit.
Aerodynamics and Wind Noise
Aerodynamic design impacts fuel efficiency, wind noise, and handling. Sleeker, more contoured boxes create less drag and typically generate less noise at highway speeds. Flat-fronted or overly tall boxes increase wind resistance, which can reduce fuel economy and produce pronounced buffeting or whistling.
If you frequently drive long distances or at higher speeds, prioritize aerodynamic models. Balance the need for low drag with the capacity requirements so you do not sacrifice necessary storage for a marginal gain in efficiency and quietness.
Build Quality and Weather Resistance
Durable construction determines how well a cargo box protects contents and how long it lasts. Look for rigid, impact-resistant shells that resist cracking from road debris or cold temperatures. Reinforced latches and corrosion-resistant hardware improve long-term reliability, especially in wet or salty environments.
Weather resistance is crucial to keep gear dry. Effective seals and drip channels reduce the risk of water ingress. Consider how the materials age under UV exposure and temperature swings because prolonged sun and seasonal extremes can soften plastics or degrade seals over time.
Security and Locking
Secure locking prevents theft and accidental opening. A box with integrated locks that secure both lid halves and protect mounting hardware reduces the risk of tampering. Evaluate how accessible the lock is while the box is installed and whether the key system is robust against forced entry.
Also think about the convenience of lock operation. Some locks can be awkward to reach once the box is mounted, particularly on taller vehicles, so a user-friendly lock design matters for regular use and peace of mind.
Access and Usability
Usability covers how easy it is to load and unload the box and how comfortable routine use will be. Dual-side opening provides convenient access from either side of the vehicle and can be helpful in tight parking situations. Consider lid lift-assist mechanisms and hinge design because these features make handling heavy lids safer and easier.
Also assess interior organization options such as tie-down points or removable dividers. These features help secure items and prevent movement during transit, which protects both cargo and the box itself.
FAQ
Will any rooftop cargo box fit my Scion xB?
Most rooftop cargo boxes attach to standard crossbars and will fit a Scion xB that has an appropriate roof rack. Fit depends on crossbar spacing, bar profile, and the vehicle's roof load limit. Check the box mounting compatibility and your roof rack specifications before buying to ensure a secure fit.
How much weight can I safely carry in a roof box?
Safe rooftop load depends on the Scion xB roof load rating and the roof rack capacity. Typical rooftop cargo boxes add their own weight, so subtract that from the total allowable load. Staying within those limits preserves handling and reduces strain on the rack and vehicle structure.
Does a rooftop box affect driving and fuel economy?
Yes. Adding a rooftop cargo box increases aerodynamic drag and can lower fuel efficiency, especially at highway speeds. A streamlined, aerodynamic box reduces that impact compared with bulky shapes. Expect some change in handling, particularly in crosswinds, and adjust driving accordingly.
Are hard shell boxes better than soft bags?
Hard shell boxes generally offer better protection from weather and road debris and can be more secure when locked. Soft bags are lighter and easier to store when not in use, but they do not protect gear as well and tend to be noisier at speed. Your choice depends on priorities like protection, storage, and convenience.
How difficult is roof box installation?
Installation difficulty varies by mounting system. Many modern boxes use simple clamps or quick-release hardware that one person can install in under 30 minutes. Heavier or larger boxes may require two people for safe lifting. Review the mounting instructions and practice securing the box on the ground before driving.
How We Chose the Best Scion xB Rooftop Cargo Box
We focused on rooftop cargo boxes that offer reliable fitment with common crossbar layouts found on the Scion xB and that provide meaningful gains in usable storage. Each candidate was evaluated for mounting compatibility, usable interior volume, and the security of its latching system. We also assessed construction quality, including shell rigidity and weather resistance, since these affect durability and protection of stored gear. Ease of installation and day-to-day usability were weighed to reflect how often owners load and unload the box. We excluded any products that required vehicle-specific rails or permanent roof modifications, as well as lightweight soft bags that do not provide rigid protection. We prioritized boxes that balance aerodynamics and noise reduction without sacrificing capacity. Final selections emphasize practical fit, secure mounting, and long-term durability rather than transient features.
Our full evaluation process is outlined in our review methodology.
Conclusion
Choosing the right rooftop cargo box for a Scion xB means balancing capacity, mounting compatibility, and aerodynamics. Prioritize a box that fits your crossbars, offers the usable interior shape you need, and provides robust mounting and weather protection. Remember the tradeoffs: larger boxes increase storage but add weight and drag, while sleeker designs reduce fuel impact but may limit space. Focus on the factors that match how you travel and how often you will install and use the box to find the best long-term fit.
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