A life of outdoor adventure is often accompanied by lots of bulky gear. Backpacks, tents, boots and skis are just some of the things you may find yourself hauling from home to trailhead. By adding a rooftop cargo box to your vehicle, you’ll gain storage space so you can take along everything you need for a fun journey without having to fill your car to the max. In this article, we help you choose the right size cargo box by discussing what you might store in a box and how to figure out which box will fit well on your vehicle.
Step 1: Think About What You Want to Store in a Cargo Box
Outdoorsy types commonly use cargo boxes for holding tents, sleeping bags, sleeping pads, backpacks, camp furniture, strollers, skis, ski poles and ski boots (tip: keep your boots in the car on the way to the slopes so they stay warm). But they’re great for other things, too, such as gardening tools, beach supplies and kids’ toys. Considering what you will stow in a cargo box will focus your search on what length, width and height your gear necessitates. As you do this, keep the following points in mind:
- Bulky, lightweight things fit well in roof boxes: Things that take up a lot of space but don’t weigh a ton are good items to put up top in roof boxes. So, things like tents, sleeping bags, sleeping pads, pillows, camp chairs, etc. are good options.
- Longer items require a longer roof box: If you plan to stow long things, such as skis and snowboards, in your roof box, then the shorter, more-compact roof boxes may not work for you. Many roof boxes will fit most lengths of downhill skis and snowboards just fine, but if you have exceptionally long skis (like a pair of 210cm cross-country skis), then you need to pay close attention to the length of the box. Compare the dimensions of your skis or other lengthy items to the internal dimensions of roof boxes to be sure they fit.
- Heavy things are better kept inside your vehicle: Most cargo boxes are designed with a maximum weight capacity of about 150 – 165 pounds (check with the box manufacturer for the exact weight limits). To avoid reaching the max weight, it’s best to stow really heavy items, like a full cooler, jugs of water and bins of dry food, inside the vehicle. It’s also important to know that just because a roof box is designed to carry 165 pounds doesn’t mean you can necessarily put that much weight in it.
To accurately figure out how much weight you can put in a box, do the following:
- Check the recommended maximum load for your vehicle—you should be able to find this info in the owner’s manual.
- Subtract the weight of the box and any other rack accessories you might also be using (like bike racks or kayak racks) from your vehicle’s maximum load.
- If you’re using aftermarket crossbars and towers/feet on your vehicle, such as those made by Yakima and Thule, then you also need to subtract that weight.
Example: If your vehicle’s maximum weight capacity is 165 pounds and your roof box weighs 50 pounds, your crossbars weigh 9 pounds and your towers/feet weigh 5 pounds, then you can put up to 101 pounds in the roof box.
Step 2: Examine the Dimensions of Cargo Boxes
Now that you have some idea of what you’ll likely store in a cargo box it’s a good time to take a closer look at the dimensions of various boxes so you can find one that’s the right size for what you need to put in it. Manufacturers combine the length, width and height of cargo boxes in different ways to achieve different results.
Length
Most cargo boxes are 6 feet long or longer. A 6-foot-long box will fit a pair of 180cm skis and most other things of that length just fine. If you have skis or other items that are longer than 180cm (5 ft. 10 in.), like a long pair of cross-country skis, then you need to look for an extra-long box that will fit them. If you never plan to carry lengthy items, a sub-6-foot box may work just fine for you.
Width
Not surprisingly, a wide roof box provides more storage capacity than a narrow one (assuming the other dimensions are similar), but it also may leave you without any space on your rack’s crossbars for things like a bike rack or kayak rack. If you want to be able to put other gear on your roof alongside the roof box, then you may need to look at narrower boxes (or wider crossbars).
Height
Increasing height is another clear way to grow the capacity. But taller boxes may prevent you from driving certain places, like into your home garage, public parking garage and drive-through restaurants. If you have a tall vehicle already, it’s worth paying attention to how much height a cargo box will add and whether that will limit where you can go.
Gear Capacity
The length, width and height combine to equal the overall gear capacity (typically expressed in cubic feet, cubic inches and/or liters) of a roof box. Most people don’t have a specific number of feet, inches or liters in mind that they need, but the gear capacity spec is still handy for an apples-to-apples comparison of just how much different boxes can hold.
Bigger boxes aren’t always better: Some people come to the conclusion that they should get a giant box just in case they ever need a bunch of extra space. Well, here are a handful of reasons why getting a bigger box than you really need might not be such a good idea:
- Bigger cargo boxes cost more: It’s simple: the bigger the box, the more you spend. If you know you don’t need that extra capacity, then save some money and get a smaller box.
- Bigger cargo boxes have a greater impact on fuel efficiency: Anything that you put on your roof, including crossbars, will impact the fuel efficiency of your vehicle. But, a big whale of a box will cut into that even more. So, if you don’t need a massive box, don’t get one. You’ll save yourself some money at the gas pump and emit less carbon into the air around you.
- Bigger cargo boxes are cumbersome: If you want to take the cargo box off your car to store it or switch it between cars, consider the size and how difficult that will be. Bigger boxes take up more space and they are typically heavier, making them harder to move and store unless you have a helping hand and ample room in a garage or shed somewhere.
- Bigger cargo boxes are noisier: More surface area means more air hitting the box and a higher likelihood of noise up top on your vehicle. For some people this isn’t a major factor, but it may be something you want to think about.
Step 3: Make Sure the Cargo Box Fits Your Car
At this point, you have likely identified a few boxes that will fit the gear you want to stow. But before you click “buy” you need to be sure the box fits well on your car. This means checking hatch clearance and thinking about how the box will look on your vehicle.
Hatch Clearance
This a very important consideration, especially if you have a hatchback or SUV with a rear door, because a cargo box that doesn’t allow appropriate hatch clearance can prevent you from opening that door all the way. If you’re able to get to a store and test out different boxes with the help of a sales specialist, that’s the surest way to check the hatch clearance of a cargo box. If that’s not an option, here’s another way to do it:
- Following manufacturer guidelines, move the front crossbar as far forward as you can on your vehicle. (Note: some crossbars are not adjustable.)
- Using a tape measure, measure from the center of your vehicle’s front crossbar to the open back hatch at the level of your crossbars.
- Compare that measurement to hatch clearance information on manufacturer websites. If your measurement is more than the clearance number listed for a particular roof box, then that roof box will fit. For example, if you measured 60 inches and the roof box requires a minimum clearance of 57 inches, then you’re good to go.
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