Are you planning a road trip and need extra storage space for your luggage? Or perhaps you’re an outdoor enthusiast looking for a way to transport your gear safely? Whatever your needs, a roof cargo box can provide the solution.

In this guide, we’ll explore some of the largest rooftop cargo boxes available on the market.

What is a Roof Cargo Box?

A roof cargo box, also known as a rooftop box or cargo carrier, is a storage container that can be mounted on the roof of your car. They come in various sizes, with the biggest roof box for cars offering up to 22 cubic feet of additional storage space.

Many cars have limited cargo space, but these big roof cargo boxes provide enough room for all your belongings, even when traveling with children, pets, or camping gear.

Both hard-shelled cargo boxes and soft-sided rooftop sacks keep cargo secure from intrusive thieves while also protecting against the elements, but there are some important differences between the two styles of cargo carrier.

Key Differences Between Cargo Bags and Cargo Boxes

• We have a complete comparison guide between cargo boxes and cargo bags here

A hard rooftop cargo carrier, also known as a roof cargo box, requires crossbars and a roof rack framework. Although they are more costly and difficult to install, they provide better security for high-value things such as skis, snowboards, or other open-air gear used for camping or bicycling. Your hard shell rooftop cargo box will come with a secure locking system.

On the other hand, a cargo bag uses a simple tie-down systems with adjustable straps, robust hooks, and zippered pockets and can be loaded on top of a car roof even without the use of rack systems. Many soft cargo carriers have watertight seams that are welded or taped, and also provide secure locking systems.

Soft roof packs are lighter, less demanding to stack and store, and do not require crossbars, but they’re constrained in what they can safely carry, and indeed, even though numerous of the best-rated items are made of strong and weatherproof materials, they can still break or drop separated at the creases. 

The Best Biggest Roof Cargo Boxes Compared

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When it comes to choosing the best large roof box, there are several factors to consider, including the size, design, material, and ease of installation. Here are some of our top picks:

Image	Title	Price	Prime	Buy
	SportRack Vista XL Rear Opening Cargo Box,Black		PrimeEligible	Buy Now
	YAKIMA, SkyBox NX 18		Prime	Buy Now
Top	Thule Motion XT Rooftop Cargo Carrier, XXL, Black		PrimeEligible	Buy Now
Top	Thule Force XT Rooftop Cargo Box, X-Large		PrimeEligible	Buy Now
Top	Thule 615 Pulse Rack, Large, Black		PrimeEligible	Buy Now

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Why Choose a Large Roof Cargo Box?

A big cargo box offers several advantages. Firstly, it provides ample storage space, allowing you to carry more luggage, gear, or equipment. Secondly, storing items on the roof can free up space inside your vehicle, making your journey more comfortable.

If you are not keen on towing a trailer for all your additional gear, then a large cargo box can be the perfect solution

• We weigh up the pros and cons of using a cargo box vs trailer over here

10 of the Best Large Roof Cargo Boxes On The Market

Our Top Pick: Sport Rack Vista XL Rear Opening Cargo Box – Best Roof Cargo Box

The Sport Rack Vista XL Raise Opening Cargo Box is one of the largest roof cargo box on the market. It has an 18-cubic-foot capacity and fits square, circular, and most plant roof racks.

SportRack Vista XL Rear Opening Cargo Box,Black

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With tool-free mounting options, the sport Rack Vista XL may be reached from either side or the back of a car, making it simple to grab items from a variety of positions.

The sport Rack Vista XL is UV-resistant and long-lasting, thanks to its ABS structure. The Sport Rack Vista XL is 63 inches long, 38 inches wide, and 19 inches tall, and it can hold up to 100 pounds of baggage.

Runner Up: Carbonite Skybox by Yakima

The Carbonite Skybox by Yakima is among the biggest roof box family. The largest model has up to 21 cubic feet of volume, a load capacity of 28 kilograms, a dual-sided opening, and a super latch system.

YAKIMA, CBX 18 Aerodynamic Rooftop Cargo Box for Cars, Wagons and SUVs

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Its most appealing characteristic is that it can be installed without the use of any equipment, making it extremely user-friendly.

It has a long, streamlined form with an aerodynamic element that reduces wind noise and drag. The box also has a locking cover to keep it safe from theft.

Runner Up: Cargo Carrier Thule Motion XT XXL

For large loads, Motion XT XXL is the best option. It has a storage capacity of 22 cubic feet and a total load capacity of 165 pounds.

Thule Motion XT Rooftop Cargo Carrier, XXL, Black

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It also comes with the Power Click quick-mounting mechanism, which makes installation simple and secure.

The Motion XT XXL stands out with a professional fit, finish, and two color option

Also Consider: Thule Force XT Rooftop Cargo Box

This versatile roof-mounted cargo box is made from a durable finish and can hold up to 165 pounds. The Thule Force XT is designed to fit a wide array of vehicles. Its clever quick-mount system clicks into place when the box is secure and tightened, ensuring a proper fit.

Thule Force XT Rooftop Cargo Box, XX-Large

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A dual-sided lockable compartment also allows for security and easy unloading when needed. The 18-cubic-foot Thule Force XT can hold up to five to seven pairs of skis or three to four snowboards.

If the high-end Motion doesn’t pique your interest, you must choose between the Force XT and the Yakima Skybox.

Both models reflect the ideal middle ground for many users, although we give the Yakima a slight advantage for a few minor reasons.

Best Medium Cargo Box: Thule Pulse Medium Rooftop Cargo Box

The Thule Pulse Medium is a 67-inch long, 33-inch wide, and 16-inch-high rooftop freight carrier that can be opened with one hand for quick loading and unloading.

Thule 614 Pulse Rack, Medium, Black

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The addition of a central locking system improves security. This unit contains 14 cubic feet of storage for snow-filled activities and can fit a few sets of skis (up to 155 cm) or three to four snowboards.

Also Consider: Sport Rack Horizon Alpine Cargo Box

This rooftop cargo carrier is made of impact-resistant ABS material and fits square, round, and most factory racks. This is one of the best roof boxes for camping. You’ll love its convenience when you go camping with it.

SportRack Horizon Cargo Box (Alpine, 11 Cubic Feet)

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It includes a centralized locking mechanism and a passenger-side aperture for cargo access that doesn’t obstruct traffic. 

The Sport Rack Horizon Alpine Luggage Box can store five to six pairs of skis (up to 180 cm) or three to four snowboards while carrying other cargo or camping supplies.

Also Consider: Thule Force Cargo Box

Thule Force is one of the best cargo boxes currently on the market. This carrier comes in various sizes, ranging from 13 to over 21 cubic feet.

Thule Force XT Rooftop Cargo Box, X-Large

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The product boasts impressive features such as a dual-sided opening, easy installation, and a built-in lock for security. It can also be put on any roof rack, regardless of manufacturer.

Best Long But Compact Cargo Box: INNO BRM660BK Wedge Cargo Box

If you park in a garage or in enclosed parking lots frequently, you should think hard about getting a rooftop box that has a large capacity but slimline design. 

Many of these rooftop boxes add nearly two feet to the height of your car’s roof (including the height of the box and the rack), which is a no-no for SUVs and minivans.

The good news is that those who need to keep a low profile have a range of options. The INNO BRM660BK Wedge Cargo Box is one of the best-looking wedges in the category, with a contoured shape that provides 11 inches of depth while only rising 9.6 inches above your rack’s crossbars.

INNO BRM660BK Wedge Cargo Box – 11 Cubic FT (Gloss Black)

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The Wedge has more to offer than just clearance: it features a high fit and finishes, with tool-free installation, a beautiful and aerodynamic form that reduces wind noise while accommodating a rear antenna and door, and a dual-sided opening that improves access and organization.

You’ll only get 11 cu ft of storage, which is well shy of the largest models we’ve discussed here, but bear in mind that it can still hold 6 snowboards, or 8 skis – which is still pretty impressive for something so slimline.

The INNO is the most low-profile rooftop box on the market, but a few versions come close behind. The Thule Pulse Alpine (also 11 cu. ft.) rises 11.3 inches off the crossbars (almost 1.5 inches higher than the Wedge 660) and only opens on the passenger side, but it costs under $500.

Largest Roof Bag: RoofPax Car Roof Bag and Rooftop Cargo Carrier

Although we are creeping into cargo bags territory here rather than boxes, we couldn’t leave this one off when discussing the largest possible cargo solutions.

The RoofPax soft rooftop cargo carrier is a bigger cargo carrier than others in its class and is amongst the best quality with a capacity of 19 cubic feet.

RoofPax Car Rooftop Cargo Carrier Bag 19 Cubic Feet Waterproof Car Roof Storage Including Double Zipper Integrated Mat 10 Heavy Duty Tie Down Straps Fit Cars with/Without Roof Top Rack or Side Rails

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This cargo bag is tough and has dual-seam technology and waterproof double zippers. It also has a double water-repellent coating, making it a watertight load carrier. It also comes with a lifetime warranty on buckles and zippers and can be used with or without roof rails.

It has a protective pad built-in and ten elastic Velcro straps and grows to about 20 inches in height when filled to capacity. It has a 47.2-inch long and 35.4-inch-wide footprint.

This product also comes in a slightly smaller 15 cubic-foot bag which extends to the same height but has a smaller footprint (43.3 inches long and 33.5 inches wide)

Also Consider: Fivklemnz Car Roof Bag Cargo Carrier

The Fivklemnz 15-cubic-foot roof bag has an anti-slip surface and adjustable straps to hold the carrier in place without harming the car. 

FIVKLEMNZ Car Rooftop Cargo Carrier Roof Bag Waterproof for All Top of Vehicle with/Without Rack Includes Topper Anti-Slip Mat + Reinforced Straps + 6 Door Hooks + Luggage Lock (15 Cubic Feet)

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The Fivklemnz soft rooftop cargo carrier is a best-seller in the marketplace, accommodating everything from multiple suitcases to a full camp setup with sleeping bags and a tent. 

This device is under seven pounds in weight and expands to almost a foot in height. It measures 43 inches in length and 33 inches in width.

Largest Overall Cargo Solution: Marksign Truck Cargo Bag with Cargo Net

So, technically, this isn’t a cargo box either. However, with a capacity of 26 cubic feet, we couldn’t pass up Marksign’s colossal alternative if you really want to maximize your cargo carrying capacity.

It measures 51 x 40 x 22 inches (130 x 100 x 55cm) and has enough room to contain everything you’ll need on your trip. This fits neatly on any vehicle bed for those of you with trucks.

MARKSIGN 100% Waterproof Truck Cargo Bag with Net, Fits Any Truck Size, 4 Rubber Handles, 26 Cubic Feet （51”x40”x22”, Patent Pending

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This product contains four heavy-duty rubber handles to make it easy to move. We looked at several designs and found this one to be a lot easier to work with.  It’s waterproof, and each bag comes with a heavy-duty 4′ x 6′ bungee net to keep the bag tight on your truck.

The net measures 8 feet by 12 feet and keeps your bag from blowing up while you’re driving. To provide a solid tie-down, Marksign contains 12 robust metal carabiners. 

The cargo bag is electrically welded from 500D tarpaulin without any microscopic holes to keep water out. Vinyl is used to coat the zipper.

The seals include velcro-closed flaps, so you can be sure to keep the rain out. Because the material is UV-resistant, it will last for a long period. 

The cargo bag comes with extra drawstring bags for storage of the cargo bag and net as a bonus.

Best Large Cargo Carrier

We must admit that we were undecided when it came to selecting our favorite rooftop cargo box. With a high-end fit and quality, very easy-to-use mounting hardware, and a slide lock handle and lock mechanism that’s hard to better, the Motion XT is undoubtedly the “best” all-rounder.

However, not every user requires the greatest, especially when “very good” can suffice for far less. And therefore, we see the Yakima Skybox on more rooftops than any other carrier: for under $600 for the 16-cubic-foot model ($649 for the 18-cubic-foot model), you get robust storage for your goods as well as a tool-free installation that works with most factory and aftermarket racks.

There’s a Skybox for everyone, with sizes ranging from 12 to 21 cubic feet and options including a low-clearance (“Lo”) model and a compact “12” that allows enough room on your rack for a bike or boat. 

Both the Motion XT and the Skybox are made to survive the rigors of the road, with tough ABS plastic and aerodynamic forms that taper at the back to fit your car’s antenna and hatch.

However, details count, and the Yakima falls short here. The turn handle requires a touch more energy than the Thule’s and isn’t as simple to operate with only one hand (it also tends to get stuck when frozen).

Biggest Roof Rack vs. Largest Capacity Roof Box

While the biggest roof rack provides a platform for carrying various items, the largest capacity roof box offers enclosed storage space, protecting your belongings from the elements. The choice between the two depends on your specific needs and preferences.

How to Choose the Biggest Roof Cargo Box

Compatibility with Roof Length

If you have a top-hinged trunk, it’s critical that the box fits smoothly with the roof and rack of your vehicle. To begin, move the front crossbar forward as far as possible (some are not adjustable). Then open the hatch and measure the back hatch to the middle of the front crossbar of the vehicle.

That distance must exceed the cargo box’s hatch clearance, as indicated on the manufacturer’s website. You’ll also want to ensure the length doesn’t obstruct visibility or interfere with any antennae in the front.

Setup of the Rack

This is rack 101 if you’ve never had a rooftop setup before. The mount is a component that mounts to the top of your vehicle and runs lengthwise (front to back). Vehicles typically have factory mounts such as raised rails, tracks, or permanent points.

If you’re working with a blank roof, you can either install a rack permanently or choose a system that works with the door jamb. 

Two crossbars or load bars are attached to the mount through four appropriate towers and are perpendicular to the roof. Crossbars come in a variety of sizes and shapes.

Each cargo box requires unique crossbars, so check to see if those crossbars are suitable for your vehicle and mount or if an adapter is needed.

Carrying Capacity & Purpose

Look at your gear before you go shopping for a rooftop cargo box. What do you need and plan to bring on your trips? Camp chairs and sleeping bags, for example, are typically shorter or packable and fit nicely in rooftop cargo bins.

For example, skis, paddles, golf clubs, and strollers will require a larger box; ensure the boxes’ inside dimensions match the length of your equipment.

To help visualize the entire volume, read the width and height of each box. The cubic-foot gear capacity is also listed on the boxes (or inches or liters). The larger your group is, the more space you’ll need for everyone’s gear.

Weight

There are two weight factors to consider: the cargo box weight and the box’s weight capacity. Without any cargo, the weight of the cargo crates shown below ranges from 20 to 66 pounds. The bulk of these carriers can comfortably carry up to 165 pounds. However, some can only carry around 110 or even 50 pounds.

If you need to move bigger objects, don’t skimp on the cargo box’s structural integrity. Stowing your heaviest items inside the vehicle, such as a fully loaded cooler, is easier and safer. Weight limits for each box should be checked with the manufacturer. Check your vehicle’s owner’s manual for the suggested maximum load as well.

Cargo boxes are made of tough plastic, and a few feature extra reinforcements, such as the steel around the bottom of the Thule Vector. 

Others have an extra layer of protection to increase their durability and weather resistance. The Pelican BX140R Cargo Case, for example, has a corrosion-resistant coating.

The quality of the hardware, such as latches and lock systems, varies, which is reflected in the price. Overall, the weight of the box is influenced by its size and materials.

Resistant to Water

Due to a waterproof exterior and weather sealing, most rooftop cargo box designs are quite weather-resistant, and they’ll generally perform a good job of blocking snow and rain.

None of these cargo crates, on the other hand, claim to be entirely watertight. Any water-sensitive or valuable cargo should be stored in a dry bag or within the rig.

Optional Extras

Extra features for comfort, practicality, and ease of use are included in a few of the top-shelf designs. For example, we like the Thule Vector’s inside LED lights and the Yakima CBX Solar’s integrated solar panel with two USB connections.

Frequently Asked Questions on Large Cargo Boxes

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Cargo boxes are a great way to provide more cargo space in your car, and it’s relatively cheap and easy to install. However, installing at the wrong position on your vehicle will impact a car’s aerodynamic performance and eventually lead to higher fuel consumption.

So, what is the best position for a roof box on a car? For the best stability with the least amount of wind resistance and drag, ideally, the cargo box should be mounted centrally and towards the rear of your car.

In this article, we provide advice on how to position your cargo box correctly on a car and the impact of the cargo box positioning.

Let’s get into it!

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Where Should A Roof Box Be Positioned On A Car?

Ideally, the best position to install your roof box is at the center of the crossbars and slightly adjusted towards the rear of your car. 

With your cargo box positioned at the central area of the crossbars, it will add stability to the car when your cargo box is fully loaded. 

If you have a dual-side opening cargo box like Thule cargo boxes, positioning it at the center will make it easier to load and unload from either side.

In addition, it would be best to position the cargo box slightly backward, closer to the vehicle’s back.

Mounting the cargo box at this position will improve aerodynamics and inspire airflow around the box. Also, it has the least wind resistance and drags for fuel usage.

Many cargo boxes have aerodynamic and sleek designs that help reduce those issues but positioning the cargo box in the correct position will significantly help better gas mileage. 

Can The Roof Box Be Positioned To One Side?

Absolutely! You can position your cargo box to one side, especially when you have a passenger-side opening cargo box like Thule Pulse Rooftop Cargo Box.

Thule Pulse Rooftop Cargo Box

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Mounting your cargo box to the passenger side will make your family members or friends quickly access essential items from the cargo box during the brief stop on the road trip.

Positioning the cargo box to one side can benefit someone with a narrow cargo box like MeeFar Roof Rack Carrier or similar models. Because of its narrow width, you still have space on the rooftop for carrying bikes or kayaks.

MeeFar Roof Rack Carrier

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However, mounting the cargo box on one side can potentially have some issues (read below).

Some Impacts You Need To Know When Positioning The Cargo Box

Having a cargo box installed on your car’s rooftop will impact and concern many cargo box owners, particularly the wind noise and gas mileage.

Also, the vehicle design contributes to the overall aerodynamic performance of a car. A hatchback car (like Subaru Outback or Honda CR-V) will perform differently than Honda Odyssey or Audi Q5.

Positioning the cargo box at different positions on the rooftop can have some impacts as follow:

• Centrally: The most ideal and recommended location where the roof box should be placed for better performance. Moreover, it is best for even weight distribution when fully loaded. It might not be ideal for those who have a passenger-side opening cargo box.

• One side (usually the passenger side): It’s ideal for the passenger-side opening cargo box for easy loading and unloading. It allows some spaces on another side for additional gears like bikes. But, weight distribution is poor, which can impact overall safety.

• Far Forward: How far forward should a roof box be? Mounting the cargo box too much forward or overhang can impact the stability of your car. It also reduces the aerodynamic effects because it increases the airflow resistance from the front windshield.

• Far Backward: One of the problems when positioning the cargo box far towards your rear is that it can interfere with the rear hatch when it is fully opened. It is true for hatchback cars. Moreover, it also causes interference with a rear antenna.

• Once you have the right position for your rooftop cargo box, make sure you read our top tips for correctly packing your cargo box, and why you might not want to drive with an empty cargo box

How To Install Your Roof Box On Car

The video below shows you how to properly install crossbars and a cargo box on a car. (It’s about 4.47 minutes long video)

What’s The Best Position For A Roof Box On A Car?

We’ve shown you the best position for a roof box on your car. For the best stability with the least amount of wind resistance and drag, a roof box should be mounted centrally and towards the rear of your vehicle. 

Of course, it’s entirely up to you to decide how and where you want to install it that suits your needs better. If you are unsure about doing it yourself, always ask someone or the dealer that you’ve bought the cargo box for help. 

More Cargo Carrying Solutions For Cars

If you’ve found this guide to cargo boxes handy, you may also like to jump further into our cargo carrier review.

Our gear expert, Terry, has been testing the best types of cargo boxes that will work with popular road tripping vehicle, including:

• Best Cargo Box for Tesla Model Y
• Best Toyota Rav4 Cargo Box
• Best Cargo Carriers for Toyota Highlander
• Best Volvo XC40 Cargo Box
• Best Subaru Crosstrek Roof Box
• Best Roof Box for Volvo XC90
• Perfect roof boxes for the Audi Q7
• Ideal Cargo Box for Audi Q3
• Best Cargo Box for Jeep Grand Cherokee

Are we missing your vehicle? Drop us a line at familyroadtripblog@gmail.com; we’re continually expanding our cargo carrier reviews and would love to help you find the perfect rooftop cargo carrier to meet your needs.

Does your vehicle lack a roof rack? You may also want to check out our article on using a car-top carrier without a roof rack.

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Are you getting ready for your next family road trip? Like most people, you’ll probably be packing your car with all sorts of things – clothes, food, camping gear, and more. But what about your luggage? 

If you’re traveling with a lot of stuff, it can be challenging to fit it all into your car. One solution is to use a roof box. 

A roof box can give you extra storage space for your belongings, and it’s a great way to keep them safe and secure while on the road. This article will share tips on how to pack a roof box for your next road trip!

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12 Tips on How to Pack a Roof Box

When packing for a road trip, it’s important to ensure everything is secure. One way to do that is by using a roof box. Here are some tips on how to pack a roof box:

1. Know Your Roof Box Weight Limits

Make sure you know the weight limit of your roof box before loading it up because every roof box has a maximum weight they’re safe for. Typically, this weight ranges from 50kg to 75kg, depending on the size of your box. 

Most companies that manufacture these items place this information in plain view. If you’re having trouble determining the weight limit for your roof box, look inside an owner’s manual.

It’s important to adhere to these weight limits, as overloading a roof box can cause it to become unstable. This could lead to the box becoming detached from your car while driving, potentially causing an accident. 

Not only is this dangerous, but it can also damage your vehicle and the roof box itself.

2. Pack The Heaviest Things In The Car First

It might seem common sense, but it’s still a good idea to pack the heaviest items in the car first, even if you use a roof box. This is because the car has a greater weight limit than the roof box. 

So packing the heaviest items in the car will ensure that the lightweight items can be stored in the roof box.

Remember, your car can handle the extra load, but your roof box has its limitation. Keeping an eye on the weight limit for your roof box will ensure the stability of your car when moving.

3. Pack Longer Items In A Roof Box Cargo Carrier

Roof boxes are available in many different sizes, so choose one large enough to fit all of your long items.

If you’re traveling with items like skis and snowboards, it’s a good idea to pack them in a roof box cargo carrier. This will keep them safe and secure while you’re on the road.

Many large roof boxes in the market, like Thule Pulse Alpine or Thule Motion, can easily accommodate 3-4 skis and 5-7 snowboards.

Thule Pulse Rooftop Cargo Box

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4. Put Your Suitcases In Your Roof Box Storage

Many roof boxes feature a special section on top specifically designed to store luggage. This can be a great way to keep your suitcases safe and secure while on the road. Plus, it can free up space in your car for other items.

If you’re traveling with a lot of luggage, choose the right roof box for carrying suitcases. This type of roof box is generally medium to high-profile, with a slightly taller dimension to accommodate a few larger suitcases.

In addition, they are designed to do the packing and unpacking much easier and keep your belongings safe and secure.

5. Distribute The Weight Evenly

When packing your roof box, it’s important to distribute the weight evenly. This will help ensure a smooth and quiet ride and prevent any items from sliding around. 

The best way to do this is by putting the heaviest items in the center of the roof box and balancing everything out as much as possible.

This might take a little time and effort, but it’s worth it in the end. Not only will your items be more secure, but you’ll also avoid any unpleasant noises while on the road.

6. Make Sure Your Roof Box Is Properly Secured

It’s important to ensure that your box and roof bars are fitted correctly and securely before hitting the open road. Check out our article about the best position for the roof box on a car.

The two most common mounting systems for roof boxes are u-shaped bolts and power click mounts, and your manual should include fitting instructions.

If you’re unsure how to fit your roof box, watch the video below.

7. Take Advantage Of Any Straps Or Holders

If your roof box comes with straps or holders, be sure to use them. This will help keep your items in place while you’re driving. In addition, it will help prevent the roof box from shifting around and becoming unstable. 

If your roof box doesn’t come with straps or holders, you can use bungee cords to secure it in place. Just be sure to tie them down tightly, so they don’t come loose while you’re on the road.

8. Wrap Things In Plastic

When packing your roof box, wrapping items in plastic is a good idea. This will help keep them dry and protected from the elements. In addition, it can help prevent them from getting scratched or damaged while you’re driving.

There are a few different ways to do this. You can use large garbage bags, which are cheap and easy to find, or purchase special packing blankets or sheets designed for this purpose.

Whichever method you choose, be sure to cover everything in plastic, so it’s well-protected.

9. Keep The Locking System Clear

The locking system is a very important component of the storage box. It needs to be sturdy and secure to feel confident about leaving your belongings in it.

When you pack your items into the box, you must ensure that your belongings don’t block or obstruct the locking system when closed. 

When you don’t ensure the locking system is clear, your storage box may spring up as you drive down the road. 

So make sure that everything is packed neatly and that there is plenty of clearance around the locking system so it can do its job properly.

10. Get Somebody To Help You Load

Rooftop cargo boxes can be difficult to load from standing on the ground, so it’s best to get somebody to help you. One person can hand you the luggage while you stand on the floor of the backseat. 

You could also use a ladder or other tool to help you reach the top, giving you greater control and spending more time organizing your storage box for the best load.

You might want to read this article about whethe