Key Takeaways
- The largest capacity alone doesn’t guarantee better functionality; ease of access and installation are equally important.
- Weatherproofing and security features vary, impacting long-term durability and theft prevention.
- Installation complexity differs; some models require no drilling, while others need tools or professional help.
- Price often correlates with build quality and capacity, but the most expensive isn’t always the best value.
- Rear opening designs can make loading easier, especially for taller or wider vehicles.
More Details on Our Top Picks
Rough Country Rooftop Cargo Box 14.5 Cu Ft – Hard Shell Roof Rack Storage Carrier, Strut Assisted, Lockable & Weatherproof, No Drill Install
This cargo box stands out for its combination of large capacity—14.46 cubic feet—and the ease of installation on most crossbar systems, including no-drill setups, making it highly adaptable for cross-country trips. Its UV-protected ABS shell resists fading and cracking, outperforming lighter or less weather-resistant options like the SportRack Vista XL, which has a slightly smaller capacity but simpler rear opening. The integrated assist struts and pull strap facilitate loading and closing heavy or bulky items, though the struts add some weight and complexity. Lockable and weather-sealed, it provides peace of mind in diverse climates, which is vital on long journeys. Compared to premium models, it offers a very competitive three-year warranty and USA-made durability, but it is somewhat bulkier and heavier, which might affect handling. Overall, this pick makes the most sense for drivers needing dependable, weatherproof capacity without sacrificing ease of use or security.
Pros:- Generous internal volume suitable for multiple luggage sets
- Lockable, weatherproof lid for long-term security
- Strut-assisted lid for easy loading and unloading
- No drill installation on most crossbar systems
Cons:- Relatively heavy at 20 pounds, affecting handling
- Bulkier profile may impact aerodynamics and fuel efficiency
- Higher price point compared to basic models
Best for: Cross-country travelers needing high capacity and weatherproof security that fits most roof racks easily.
Not ideal for: Owners with very limited garage space or vehicles with factory rails incompatible with universal mounts, due to its weight and size.
- Capacity:14.5 cubic feet
- Dimensions:65″ L x 32″ W x 13″ H
- Weight:20 pounds
- Material:UV-protected ABS
- Mounting:Universal crossbar fit, no drill
- Weatherproof:Yes
Bottom line: Ideal for cross-country drivers who prioritize durability, security, and capacity without complex installation, despite some weight and bulk tradeoffs.
Garvee Heavy Duty Hard Shell Roof Top Cargo Carrier – 69(L) x33(W) x11(H) Waterproof Lockable Storage Box Capacity 165 Lbs 17 Cu Ft – Tool-Free Install- Fits SUV, Truck, Van
This model excels with its substantial 17 cubic feet capacity and 165-pound load limit, making it suitable for extensive cross-country gear hauling, especially when compared with the more compact GarveeTech 70-inch. Its rugged ABS shell resists harsh weather, providing peace of mind on long trips, while the tool-free installation ensures quick setup on SUVs, trucks, or vans. The lockable, dual-sided access enhances security and convenience, though the box’s bulk can affect vehicle aerodynamics and fuel economy over long distances. It’s slightly heavier at 43.65 pounds, which may require more effort to handle and install. The 30-day warranty offers some peace of mind, although it’s less comprehensive than higher-end models. This pick makes the most sense for those needing a heavy-duty, large-capacity cargo solution that’s quick to install and highly durable, at the expense of some added weight and potential wind noise.
Pros:- High 17 cu ft capacity for large gear
- Heavy-duty weatherproof ABS shell
- Lockable for security with dual-side access
- Tool-free quick installation
Cons:- Bulky profile may increase wind resistance
- Heavier weight at over 43 pounds
- Less aerodynamic, potentially increasing fuel costs
Best for: Adventure-seeking cross-country travelers who need a tough, high-capacity cargo box that installs easily on most vehicles.
Not ideal for: Drivers prioritizing aerodynamic efficiency or seeking a lightweight, minimalist solution for short trips, due to its weight and bulk.
- Capacity:17 cubic feet
- Dimensions:69″ L x 33″ W x 11″ H
- Weight:43.65 pounds
- Material:ABS plastic
- Mounting:Universal fit, tool-free
- Weatherproof:Yes
Bottom line: Best suited for those who need a robust, large-capacity cargo box for long trips, willing to accept some wind drag and added weight.
GarveeTech 70 Inch Rooftop Cargo Box Carrier, 17.7 Cubic Ft. Hard Shell Roof Rack Cargo Carrier with Security Keys, 165 Lbs Capacity Waterproof Rooftop Storage Box, Dual Side Opening
This cargo box offers a spacious 17.7 cubic feet and a robust 165-pound capacity, with the added benefit of dual side opening for easy loading from either side—a feature that outperforms the rear-only access of the SportRack Vista XL. Its impact-resistant ABS shell provides excellent weather protection, making it ideal for diverse climates encountered on cross-country trips. The wind-efficient aerodynamic shape and quiet profile help reduce noise and drag, although the larger size may slightly impact fuel economy. The security keys and reinforced locking system protect valuables, but the box’s size and weight—over 42 pounds—may pose handling challenges during installation. Its compatibility with various roof rack types makes it versatile, though always check specific fit guides. This model is perfect for travelers needing quick access and weatherproof durability in a large, secure cargo carrier.
Pros:- Largest capacity among similar models
- Dual side opening for convenience
- Weatherproof, impact-resistant shell
- Lockable with security keys
Cons:- Heavy at over 42 pounds
- Size may increase wind noise
- Requires ample roof space and careful handling
Best for: Long-distance road trippers who value dual side access and weatherproof security for bulky gear.
Not ideal for: Those with smaller vehicles or seeking a lightweight or low-profile carrier for city driving, due to its size and weight.
- Capacity:17.7 cubic feet
- Dimensions:70″ L x 31″ W x 15″ H
- Weight:42.1 pounds
- Material:ABS plastic
- Mounting:Universal fit, impact-resistant
- Weatherproof:Yes
Bottom line: Perfect for cross-country travelers needing quick access, weather protection, and high capacity, accepting some handling and aerodynamic trade-offs.
Rooftop Cargo Box Carrier Large 13 Cubic Feet Car Top Mount Travel Luggage Storage, Dual Side Opening, Heavy Duty Waterproof Rooftop Storage Box Extra Keys, Straps, Black
This cargo box provides a solid 13 cubic feet of storage—less than some larger models but still ample for cross-country trips—and features dual side opening for convenient loading, outperforming rear-only access options like the SportRack Vista XL. Its impact-resistant ABS and PMMA construction ensures durability and weatherproofing, while the 130-lb load capacity meets typical luggage needs. The tool-free installation and extra keys add to user convenience, though the slightly smaller size and weight (27.83 pounds) make handling easier for those with limited mobility or smaller vehicles. Its black finish blends well with many vehicle colors and maintains a sleek appearance, although it might lack some of the premium features like locking and advanced aerodynamics seen in higher-end models. This choice suits travelers who want a reliable, compact, yet large enough cargo solution for cross-country adventures.
Pros:- Decent 13 cu ft capacity
- Dual side opening for easy access
- Weatherproof and impact-resistant shell
- Lightweight and easy to install
Cons:- Less capacity than 17+ cu ft models
- No mention of lockable features
- Smaller size may limit gear volume
Best for: Cross-country travelers seeking a balanced size, ease of handling, and reliable weatherproof features.
Not ideal for: Those requiring maximum capacity or aerodynamic efficiency for very long journeys, due to its slightly smaller volume.
- Capacity:13 cubic feet
- Dimensions:55.91″ L x 29.53″ W x 14.96″ H
- Weight:27.83 pounds
- Material:ABS+PC
- Mounting:Universal fit
- Weatherproof:Yes
Bottom line: Great for those wanting a manageable, weatherproof cargo box with dual access for cross-country trips, balancing size and handling.
SportRack Vista XL Rear Opening Cargo Box,Black
The SportRack Vista XL offers a generous 18 cubic feet of internal space, making it one of the largest rear-opening cargo boxes, ideal for cross-country gear. Its UV-resistant ABS shell is durable and weather resistant, and the rear opening simplifies loading away from traffic—advantageous over side-opening models like the GarveeTech. Its tool-free mounting setup allows quick installation on most racks, though it lacks lockable features, which may be a concern for theft-sensitive items. The large size can affect vehicle aerodynamics, but it remains popular for its affordability and capacity. Its 48-pound weight balances durability with manageable handling, although the absence of locking might limit its appeal for long trips with valuable gear. Overall, a practical, budget-conscious choice for extensive cargo needs.
Pros:- Largest capacity among rear-opening models
- Durable UV-resistant shell
- Easy tool-free mounting
- Rear access for unloading away from traffic
Cons:- No lockable features
- Can impact vehicle aerodynamics
- Heavy for some users at nearly 50 pounds
Best for: Budget-conscious cross-country travelers who prioritize maximum cargo volume and easy access, but do not require locking security.
Not ideal for: Travelers needing high security or aerodynamic efficiency, due to its open design and lack of locks.
- Capacity:18 cubic feet
- Dimensions:63″ L x 38″ W x 19″ H
- Weight:48 pounds
- Material:UV-resistant ABS
- Mounting:Fits most racks, tool-free
- Weatherproof:Yes
Bottom line: A solid, spacious, rear-opening cargo box ideal for budget-minded travelers, with the tradeoff of no security lock and some aerodynamic drag.
RoofPax XXL 28 cuft Car Rooftop Cargo Carrier Bag Extra Waterproof Car Roof Storage with 10 Heavy Duty Tie Down Straps and 4 Hooks Roof Bag Cargo Carrier for Top of Vehicle with/Without Rack
This option stands out for its patented secure mounting system, which uses door hook straps that attach outside the vehicle, providing a safer and more stable connection compared to traditional straps that go inside the car—this makes it especially attractive over the JEGS hard shell, which relies on roof rack compatibility. With an extra-large 28 cuft capacity, the RoofPax bag offers ample space for gear, yet it remains flexible for SUVs and larger vehicles, thanks to clear fit guidelines. Its weatherproof design, including dual zippers and double-seam technology, ensures your belongings stay dry even in heavy rain, though the soft-sided nature means it might be less impact-resistant than the hard shell. Included straps, locks, and a storage bag make setup and storage straightforward, plus a lifetime warranty adds peace of mind. The main tradeoff? Its soft structure can be vulnerable to high winds or sharp objects, unlike the JEGS hard shell, which offers more impact resistance. This pick makes the most sense for cross-country travelers who prioritize capacity, safety, and weather protection.
Pros:- Huge 28 cuft capacity fits a large amount of gear
- Patented outside mount system enhances safety and stability
- Weatherproof construction keeps contents dry in heavy rain
- Includes straps, locks, and a durable storage bag
Cons:- Soft-sided design offers less impact protection than hard shells
- Installation requires careful alignment, especially without roof racks
- Wind resistance can be an issue at high speeds
Best for: Families or groups needing maximum cargo volume with versatile vehicle compatibility
Not ideal for: Drivers seeking impact-resistant protection or frequent off-road use, due to its soft-sided design
- Capacity:28 cubic feet
- Mounting System:Patented external door hook straps
- Water Resistance:Waterproof, double-seam technology
- Material:Heavy-duty water-repellent fabric
- Includes:Straps, locks, storage bag
- Compatibility:Fits vehicles with or without roof racks
Bottom line: This soft-sided rooftop bag is ideal for cross-country trips where maximum capacity and weatherproofing are priorities, but impacts and high-speed wind may be a concern.
JEGS Rooftop Cargo Carrier for Car Storage – Large Roof Rack Style Carrier – Heavy Duty Weatherproof Storage – Made in USA – 18 Cubic Ft – 110 Lb Capacity – Aero Hard Shell
This model is better suited to drivers who prioritize impact resistance and security, especially in urban or rugged environments, compared with the RoofPax soft bag. Its aerodynamic hard shell reduces wind drag and noise, helping maintain fuel efficiency during long trips, and the lockable four-corner system offers peace of mind against theft. With an 18 cuft capacity, it’s slightly more compact but still ample for many cross-country needs, particularly when combined with a roof rack, which the JEGS is specifically designed to support. Its easy, tool-free installation on vehicles with roof rails or crossbars makes setup straightforward, while the made in USA quality assurance is appealing for those seeking durability. A notable tradeoff? The hard shell provides excellent impact resistance but adds weight (about 35 pounds), making mounting and removal slightly more challenging than the soft RoofPax. Also, its fixed capacity means less flexibility for overpacking compared to the soft bag. This pick is perfect for those who want a rugged, lockable, aerodynamic shell for secure cross-country trips.
Pros:- Impact-resistant HDPE shell provides durability
- Aerodynamic shape reduces wind noise and drag
- Lockable four-corner system enhances security
- Easy, tool-free installation on roof racks
Cons:- Slightly smaller capacity at 18 cuft
- Heavier weight (~35 lbs) can complicate handling
- Less flexible in capacity compared to soft bags
Best for: Travelers seeking impact-resistant, lockable, and aerodynamic cargo solutions for long-distance trips
Not ideal for: Those needing maximum storage capacity or versatile mounting options without roof racks, due to its fixed size and rack dependency
- Capacity:18 cubic feet
- Material:HDPE plastic shell
- Weight:35 pounds
- Locking System:Four-corner lock with front latch
- Design:Aerodynamic shape
- Compatibility:Fits vehicles with roof rails or crossbars
Bottom line: This hard-shell cargo carrier excels in impact resistance and security, making it suitable for drivers prioritizing durability over maximum volume.
