The Roof Box Size Guide of 2022

While choosing a roof cargo box, you always have to make sure that it comes with enough storage space that you need and it is compatible with your car and as well as your roof rack.

You have to consider all the factors, including the cubic feet of the roof box or how wide and tall it is so that you can make the right decision.

You can take the help of a cargo box size guide so that you can understand the various sizes and factors, and then you will be able to make the right decision for you.

In this article, you will find a guide about roof cargo boxes. You will also find our favorite boxes into sizes to make sure that you understand the various sizes and factors and make the right decision for you by considering all of them.

At first, you should consider the length and width of the roof box. You should know that an extra inch length or an extra inch height does not provide so much storage space. So you will be able to store almost the same amount of cargo in the roof cargo box.

By considering the length and width of the roof box you are willing to buy, you will be able to make sure that it will not cause any problem in opening the rear hatch of your car or seeing out of the front windshield.

Here’s our Roof Box Size guide:

1. Choosing a Half-Width Roof Cargo Box

We Selected: Thule 682 SideKick Cargo Box

Thule Sidekick Rooftop Cargo Box Grey, One Size
  • Compact roofbox, ideal for small loads such as camping gear or golf clubs
  • Sturdy U-bolts with reinforcement plates and adjustable brackets provide a secure fit to rack
  • Compact design leaves room for other roof mounted accessories
  • Passenger side opening for easier loading and unloading
  • External Dimensions: 54 x 25 x 15.5 in

If you are looking for a roof cargo box so that you can have some extra space on your roof rack after installing a roof cargo box, then this roof cargo box will be a great option for you.

This roof cargo box comes with a narrower design. This Thule cargo box is only 25 inches wide. It is one of the skinnier models available on the market. So while installing this roof box, you do not have to keep it in the middle of your roof rack. You will be able to attach it on one side, and there will be a good amount of space to attach other items to the roof rack securely. It really comes with the great build quality, but if you have a large family and you are looking for something to carry all the items of your family hen this roof box may not be large enough for you. 

This Thule cargo box will provide you with a lot of great features. It comes with a U bolt mounting system so that you can install it with more security. It also has two included locks, so there is nothing to worry about your items getting snatched from your roof box. Moreover, you will be able to store it in a small space in your garage while it is not in use. 

A usual half-width cargo box comes with the following specification:

  • Capacity : 220 litres or 7 cupic feet
  • Dimensions : 137 x 64 x 39 cm or 54 x 25 x 15 inches
  • Weight (lbs) : 16 lbs
  • Weight (kg) : 7.2 kg

2. Choosing a Wide Roof Cargo Box

We Selected: JEGS Performance Products 90098 Rooftop Cargo Carrier

JEGS Rooftop Cargo Carrier | Hard Car Top Large Luggage Box | Waterproof Storage | Heavy Duty Solid...
  • SECURE & PROTECT YOUR GEAR in this 18 cubic ft. HDPE plastic hard shell car top cargo carrier; high-capacity interior dimensions 57 L x 38 1/2 W x 17 3/4 H inches; aerodynamic design for fuel efficiency
  • WATERPROOF STORAGE FOR YOUR LUGGAGE with a four corner locking system, front latch, and weather-tight seal for ultimate car rooftop protection and security
  • EASY & CONVENIENT LOADING AND UNLOADING from either side of the car make for smooth travel and hassle-free storage
  • NO TOOLS REQUIRED, EASY ASSEMBLY AND INSTALLATION. All mounting hardware and simple instructions are included to get you safely on the road quickly
  • MADE IN USA, LIMITED LIFETIME GUARANTEE. The JEGS Rooftop Cargo Carrier’s high-quality construction and performance give you peace of mind

This roof cargo box is 39 inches wide, so you will not be able to attach anything else to your roof rack after installing this cargo carrier. 

This type of carrier will provide you with a lot of storage space, including enough security for your items inside the cargo box. So you will be able to carry all your items easily without worrying about damaging anything.

This roof cargo box comes with 18 cubic feet of storage space. So if you are looking for something to carry all your family’s items with enough security, you should check out this one. This cargo box has enough room for all your belongings. It would be best if you read till the end of this roof box size guide so that you can make the right decision for yourself and your family.

Though this roof box is much larger than a half-width roof box, it can still be installed easily on top of your car. Moreover, the installation process does not require any tools. This roof cargo box only weighs 28 lbs. So anyone will be able to lift this cargo box very easily and install them without facing any problem. 

A usual wide width roof box comes with the following specification:

  • Capacity : 510 litres or 18 cubic feet
  • Dimensions : 144 x 99 x 48 cm or 57 x 39 x 19 inches
  • Weight (lbs) : 28 lbs
  • Weight (kg) : 12 kg

3. Choose a Short Roof Cargo Box

We selected: SportRack Vista XL Rear Opening Cargo Box

SportRack Vista XL Rear Opening Cargo Box
  • 18 cubic foot (510 L) internal cargo capacity
  • Made from durable UV-resistant ABS material
  • Rear opening for easy access away from traffic
  • Tool-free mounting hardware for easy installation and removal
  • Includes key and lock to secure contents in the box, and the box to your rack

You will need to take into consideration the size and style of your car and the length of the roof cargo box as well. So that you do not face any problem while driving the car or the cargo box, do not make any problem in your vision through the windshield.

There are available roof cargo boxes for shorter cars as well, but you have to choose the right size so that it does not make any difficulty in driving the car. 

If you buy a roof cargo box that is too long for your car, then you might not be able to open the rear hatch door of your car fully. It can also interrupt your vision through the front windshield. 

The SportRack Vista XL Roof Top Cargo Carrier is 62.8 inches long only. Though this roof cargo box is much shorter than others on the market, it still comes with enough space for all your belongings. You can easily install it on top of a shorter car without facing any problem.

When you are looking for a short roof cargo box, you should know that these cargo boxes are short, but they are tall enough to provide you with enough storage space. The design of the cargo box can affect aerodynamics, so you have to consider all dimensions while you are actually looking for a shorter roof cargo box.

A usual short width roof box comes with the following specification:

  • Capacity (liter) : 100 pounds
  • Capacity (cubic feet) : 18 cubic feet
  • Dimensions : 19 x 63 x 38 inches
  • Weight : 28 lbs or 12 kg

4. Choose a Long Roof Cargo Box

We selected: Yakima Skybox Carbonite Cargo Box.

YAKIMA - SkyBox Aerodynamic Rooftop Cargo Box for Cars, Wagons and SUVs, 21 (adds 21 cubic ft. of...
  • Sleek aerodynamic Carbonite textured lid; Designed with internal lid stiffeners for durability and easy open and close
  • SuperLatch security ensures your lid is secure to its base, and your gear is safe; Dual-sided opening for easy access on either side of your vehicle; Tapered design reduces hatch interference
  • No assembly required; Tool-free installation/removal from vehicle; SKS Locks included
  • Fits Yakima round, square, factory, and aerodynamic bars; Minimum and maximum crossbar spreads: 24" - 42"
  • Hauls gear for up to 5 campers; fits snowboards and skis up to 215cm; Available in five sizes: Lo, 12, 16, 18, and 21 cubic feet

This roof cargo box from Yakima is a great option for Longer vehicles. There are a lot of long roof cargo boxes available on the market. So you can easily choose the one that satisfies your needs according to your budget.

Longer roof cargo boxes will provide you with a lot of storage space. You can even transport skis, snowboards, or fishing rods with it. You do not have to worry about accidentally damaging anything. If you are looking for a roof cargo box to carry any sports equipment, you have to make sure that the cargo box you are willing to buy has enough storage space to accommodate the sports gear you want to carry. 

This roof cargo box can accommodate skis and snowboards up to 72 inches long. It also comes with a very sleek and aerodynamic design. So it will not decrease your gas mileage that much.

This Yakima roof cargo box is made out of 80% recycled material. It comes with internal lid stiffeners, so the lid will not bend or become warped when you open and close the cargo box, which is an important feature for longer roof cargo boxes.

A usual long roof box comes with the following specification

  • Capacity: 510 liters or 18 cubic feet
  • Dimensions: 252 x 92 x 41 cm or 92 x 36 x 16 inches
  • Weight : 52 lbs or 24 kg

5. Choose a Small Capacity Roof Cargo Box

We selected: JEGS 90097 Rooftop Cargo Carrier.

JEGS Rooftop Cargo Carrier | Hard Car Top Small Luggage Box | Waterproof Storage | Heavy Duty Solid...
  • SECURE & PROTECT YOUR GEAR in this 10 cubic ft. HDPE plastic hard shell car top cargo carrier; high-capacity interior dimensions 46 1/2 L x 30 1/2 W x 17 1/2 H inches; aerodynamic design for fuel efficiency
  • WATERPROOF STORAGE FOR YOUR LUGGAGE with a four corner locking system, front latch, and weather-tight seal for ultimate car rooftop protection and security
  • EASY & CONVENIENT LOADING AND UNLOADING from either side of the car make for smooth travel and hassle-free storage
  • NO TOOLS REQUIRED, EASY ASSEMBLY AND INSTALLATION. All mounting hardware and simple instructions are included to get you safely on the road quickly
  • MADE IN USA, LIMITED LIFETIME GUARANTEE. The JEGS Rooftop Cargo Carrier’s high-quality construction and performance give you peace of mind

If you are looking for a roof cargo box to carry only a few items, you should choose a smaller one. These cargo boxes are less expensive, lighter weight, and very easy to install and remove than a large roof cargo box. These cargo boxes are easier to store also when not in use.

This roof cargo box comes with nine cubic feet of internal storage space. So it is a great option for carrying extra clothing, toys, or gear that won’t fit in the car.

This type of roof cargo box is a suitable option for smaller families. The JEGS 90097 Rooftop Cargo Carrier weighs 21 lbs only. So anyone can easily lift this cargo box and install them on top of their car. It is very easy to remove as well. 

When you are specifically looking for a very small roof box, you have to make sure that the cargo box you want to buy is compatible with the roof rack of your car. You should check both the internal and external dimensions so that you do not face any problem in fitting this cargo carrier on top of your car.

A usual small capacity roof cargo box comes with the following specification

  • Capacity: 255 liters or nine cubic feet
  • Dimensions : 120 x 69 x 43 cm or 47 x 27 x 17 inches
  • Weight : 21 lbs or 10 kg

6. Choose a Large Capacity Roof Cargo Box

We selected the Thule Motion XT Rooftop Cargo Carrier

Thule Motion XT Rooftop Cargo Carrier, XXL , Black
  • Oversized roof-mounted cargo box provides 22 cubic feet of additional packing space
  • Designed for optimal space efficiency, aerodynamics, and vehicle fit
  • Quick-mount system "clicks" when roof box is secure and properly mounted
  • Dual-side opening for quick access from either side of the car
  • Easy to open and close with grip-friendly handles and supporting lid-lifters

This roof cargo box from Thule is XX-Large, and it can provide you with 22 cubic feet of storage space. While providing you this much storage space, this roof cargo box also comes with an aerodynamic design. So you do not have to worry about your gas mileage being affected negatively.

Though it is a larger-sized roof cargo box, it is designed with many safety features so that you do not face any problems while using it, and all of your items inside the cargo box will be safe and far from any kind of damage. It also comes with a slide lock system that has separate opening and locking functions on it. So you never have to worry about the security of your items inside the roof cargo box. 

This type of large roof cargo box comes with a possibility of making problems in opening the hatch door of your car, but this cargo box from Thule is designed to sit in a forward position on the roof of your car so that you do not face this types of problems. All you have to do is make sure that the forward position of this cargo box will not cause any problem for your driving so that you can be safe on the road.

A usual large capacity roof cargo box comes with the following specification

  • Capacity : 623 litres or 22 cubic feet
  • Dimensions : 234 x 97 x 46 cm 92 x 38 x 18 inchesor
  • Weight (lbs) : 55 lbs or 25 kg

Conclusion

We hope that this roof box size guide will help you to make the right decision for you and your family. You can easily choose from some of the best quality roof cargo boxes.

You should consider the relationship between the internal capacity, width, and length of your new roof cargo box before you make any purchase so that you do not have to regret your decision.

You should consider the size of your roof cargo box very carefully. Then you have to consider the style and appearance so that you do not face any problems after buying.

-our editorial board has reviewed this article and has been approved for publication according to our editorial policy.

Best Seller List of Rooftop Cargo Boxes:

Bestseller No. 1
Thule Pulse Rooftop Cargo Box, Medium
  • Functional rooftop cargo box provides 14 cubic feet of additional packing space
  • Rugged and durable design keep contents protected
  • FastGrip quick-mount system assembles in minutes
  • Passenger-side opening for easy loading and unloading
  • Central Locking system provides maximum safety
Bestseller No. 2
SportRack Vista XL Rear Opening Cargo Box
  • 18 cubic foot (510 L) internal cargo capacity
  • Made from durable UV-resistant ABS material
  • Rear opening for easy access away from traffic
  • Tool-free mounting hardware for easy installation and removal
  • Includes key and lock to secure contents in the box, and the box to your rack
Bestseller No. 3
JEGS Rooftop Cargo Carrier | Hard Car Top Large Luggage Box | Waterproof Storage | Heavy Duty Solid...
  • SECURE & PROTECT YOUR GEAR in this 18 cubic ft. HDPE plastic hard shell car top cargo carrier; high-capacity interior dimensions 57 L x 38 1/2 W x 17 3/4 H inches; aerodynamic design for fuel efficiency
  • WATERPROOF STORAGE FOR YOUR LUGGAGE with a four corner locking system, front latch, and weather-tight seal for ultimate car rooftop protection and security
  • EASY & CONVENIENT LOADING AND UNLOADING from either side of the car make for smooth travel and hassle-free storage
  • NO TOOLS REQUIRED, EASY ASSEMBLY AND INSTALLATION. All mounting hardware and simple instructions are included to get you safely on the road quickly
  • MADE IN USA, LIMITED LIFETIME GUARANTEE. The JEGS Rooftop Cargo Carrier’s high-quality construction and performance give you peace of mind
Bestseller No. 4
Thule Force XT Rooftop Cargo Box, Sport
  • A versatile roof-mounted cargo box for everyday use
  • Narrow design leaves space for other gear such as bikes, kayaks, skis, and more while providing 11 cubic feet of additional packing space
  • Designed to fit a wide range of vehicles; works with most factory and aftermarket roof racks
  • Quick and tool-free PowerClick mounting system "clicks" when roof box is secure and properly mounted - takes less than 5 minutes to install
  • Dual-side opening for easy access to all areas of the box, from either side of the vehicle
Bestseller No. 5
Waterproof Heavy Duty Hard Shell Roof Top Mount Car Storage Travel Luggage Box Cargo Carrier with...
  • ▶️ This roof top storage box is universal fit for mounting to max 13 inches wide cross bar, please check the dimension before purchase.
  • ▶️ The package comes with [1] 53 inches length storage box, [2] security lock key, and [4] heavy duty tool free installation mounting brackets.
  • ▶️ It is constructed of rugged, impact-resistant ABS material to ensure a long lasting life in outdoor conditions. More, it can open from the side and stay open till you close it with the strong support arm.
  • ▶️ Opens on the passenger side to 14 inches wide to store bulky items from the side and stays open till you close it, and it is very easy to install without any tool required to assembly.
  • ▶️ Overall Dimensions: 53" L x 34" W x 15" H | Capacity: 11 Cubic Feet and up to 110 LBS
Bestseller No. 6
UBASE Upgraded Rooftop Cargo Carrier, 15 Cubic feet 100% Waterproof Car Roof Bag with Anti-Slip Mat,...
  • 【Large Capacity Rooftop Cargo Carrier】: UBASE roof bag was designed to solve the problem of limited storage space in the car. It can easily storage 2 sleep-bags, 1 tent, 1 yoga bag, 1 hiking bag, 2 medium luggage.
  • 【Most Safe Vehicle Cargo Carrier】: There are 2 long transverse straps trussing up the objects in the bag to avoid them moving. You can fasten the bag with 6 buckles to avoid the bag being torn into 2 pieces by heavy burden. The equipped anti-slip mat to keep the cargo bag stay in place even in high speed road or bump road, no slip, no scratch to your car.
  • 【100% Waterproof Cargo Bag】: It’s made of super thick HIGH DENSITY 500D PVC material, which is 100% waterproof and very strong. We use heat to melt PVC fabrics and press them together with machine process to avoid any slits. It’s sealed with upgraded waterproof zipper. There is a widened zipper flap that helps keep your items 100% dry.
  • 【Universal Cargo Carrier】: Our upgraded rooftop cargo carrier fits for any car, truck, or SUV. you can use straps to fix the cargo carrier with your car rack, or you can use the hooks to fix the cargo carrier to the inner frame of door.
  • 【Fold It When It’s Empty】: We put a storage bag in the box for you. You may fold it when you don’t go out. It can keep the bag clean and save room for you.
Bestseller No. 7
Thule Motion XT Rooftop Cargo Carrier, XL , Black
  • Roof-mounted cargo box provides 18 cubic feet of additional packing space
  • Designed for optimal space efficiency, aerodynamics, and vehicle fit
  • Quick-mount system "clicks" when roof box is secure and properly mounted
  • Dual-side opening for quick access from either side of the car
  • Easy to open and close with grip-friendly handles and supporting lid-lifters
Bestseller No. 8
Vetoos 21 Cubic Feet Car Rooftop Cargo Carrier Bag, Soft Roof Top Luggage Bag for All Vechicles SUV...
  • 【OVERSIZED 21 CUBIC FEET】Massive 21 cubic feet (L52" x W39.5" x H17.5") of space can easily hold all luggage of a family of 5-6. Most other roof cargo carriers are small and there is not enough room to accommodate everything you need.
  • 【HIGH DENSITY 700D PVC】Features triple-layer high density 700D PVC fabric. This material is 1.5 times stronger than 500D PVC fabric, which most other rooftop bags adopts and can easily rip. The coated surface can effectively protect your luggage against rain, grit, snow, wind and sun on the road.
  • 【UPGRADED WATERPROOF ZIP】While other rooftop carrier bags let in water through the normal zipper, we've upgraded it to a waterproof zipper and fitted it with a widened 4.7" zipper flap that helps keep your items 100% dry.
  • 【REINFORCED STRAP SEAM】We notice that the straps of other cargo bags can easily rip from the seam, so we doubly reinforced the strap seam. And all seams of this cargo bag are heat welded and stitched to ensure they are watertight.
  • 【FIT ALL CARS】Whether your car is with roof rack or not, the 4 door hooks and 8 strong straps can always secure your roof top carrier bag. In addition, the equipped anti-slip mat can keep the cargo bag stay in place even in high speed road, and protect your car roof from scratches and damage.
Bestseller No. 9
MeeFar Car Roof Bag XBEEK Rooftop top Cargo Carrier Bag 20 Cubic feet Waterproof for All Cars...
  • 100% WATERPROOF &TEARPROOF MATERIAL - Made of 100% waterproof material, 700D PVC tarpaulin, Grid material with High frequency voltage technology, durable and heavy duty style bag;
  • EASY TO USE - The MeeFar XBEEK roof bag come with 1x anti-slip mats, 1x luggage lock, 6x security hooks, and 1x storage box, it can be quickly and easily installed in minutes; Made of soft shell material, it can be folded into the storage bag to save space while not in use;
  • UNIVERSAL COMPATIBILITY - The MeeFar XBEEK roof bag can be used with any sized car or SUV, work both with car with or without roof rack;
  • MORE SECURITY - Come with BONUS combination lock, it will not only prevent the zippers from slipping, but also adds security to luggage;
  • LARGE STORAGE SPACE - 20 cubic feet 51” (L) X 40” (W) X 17” (H) rooftop cargo bag allows you to hold 4-6 suitcases, travel luggage case, tents, sleeping bags and more.
Bestseller No. 10
21 Cubic Ft Rooftop Cargo Carrier For Top Of Vehicle, 100% Waterproof Soft Roof Top Luggage Cargo...
  • 21 CF ULTRA-LARGE STORAGE CAPACITY: To expand the limited spaces inside vehicle, the rooftop cargo bag provides 21 cubic feet oversized car roof storage space, roof cargo bag dimensions: 52’’L x 39’’D x 18’’H, the roof rack cargo carrier can be easy to hold luggage for your family of 6-8 persons, 4-6 suitcases, travel luggage, tents, sleeping bags and more .
  • 100% WATERPROOF PROTECTION: Made of premium quality 840D tarpaulin material, with water proof PVC coating inner and outside layers, INNOVATIVE DESIGN - seamless whole piece fabric on the bottom to avoid wet and keep cargo dry and clean, leading heat welded technology, water-proof zipper with widened flap, ensures the roof cargo carrier durable to withstand rain, grit, snow, wind weathers .
  • MOST SECURITY STRUCTURE: Equipped with 10 strong wide straps + 2 cross long straps, a free anti-slip mat , all-rounded to fix the car roof bag in place, no slip and no scratch to your car top, maximum secure your luggage at any highway speed trip, the BONUS combination TSA lock, added better protection to your luggage when take a break on the road .
  • FIT FOR CARS WITHOUT/WITH RACK : The vehicle cargo carriers well works for all hardtop cars with roof rack or without roof rack , comes with 6 security hooks, even if there is no roof side rails or roof rack on your top of car, you can buckle it into the car door frame easily, this car roof cargo carrier fits any sized cars, SUV, vans and medium to large sedans, etc .
  • EASY TO INSTALL AND STORAGE : The car top carrier roof bag has been in solid construction already , you can easy install in minutes and start your journey , Alternative to the hard shell roof cargo carrier made of soft shell material, which can be folded into the storage bag in small size to save space, simple cleaning with a couple of wipes, and ready for next time journey !

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Last Update : 2022-01-13

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