What can you do with roof racks?
What can you mount on car rooftop crossbars?

After successfully installing a pair of crossbars, you can use rooftop cargo carriers to deliver things from gear to luggage. You can install the following rooftop cargo carriers on roof racks:

Cargo Boxes
Cargo Bags
Cargo Baskets
Bike Racks
Ski Carriers
Kayak Carriers
Rooftop Tents
Choosing a rooftop cargo carrier is always a question for most outdoor enthusiasts, and it is a question that depends on your situation, not a regular answer for everyone. You can refer to an article and get tips and tricks for selecting the best cargo carriers.

Then, we talk about the above cargo carriers one by one with examples.

Cargo boxes are hardshell waterproof boxes that you can mount and lock on roof bars for carrying belongings and sporting gear. They are the most secure options because of their sealed bodies and lockable lids. As a result, cargo boxes are popular in recent years ( also named rooftop cargo boxes, roof boxes, and car roof boxes ). We have a list of the best cargo boxes for your consideration.
Cargo Baskets are platform-style rooftop cargo carriers that you can use to carry tools, gear, large equipment, and other waterproof things. However, some people use cargo baskets as a large base for mounting other rooftop carriers. For example, you can mount a narrow-design roof box and several bike racks or ski carriers on a cargo basket. Otherwise, if you want to use a cargo basket to deliver things on rainy days, you can put a soft cargo bag on a basket to create waterproof storage space like a cargo box. We have a list of the best cargo baskets for your consideration.
Cargo bags are soft, waterproof, and foldable. They are perfect for temporary use for most outdoor events, but most cargo bags won’t guarantee 100% waterproof because of design problems. Most manufacturers use zipper systems on soft cargo bags, but these zipper systems are hard to prevent all the water from getting inside the bags. On the other hand, some soft bags have flaps covering the zipper system to make things better. We have a list of the most popular soft cargo bags for your consideration.
A rooftop bike rack can transport a single bike on the car roof, and you can mount a bike rack beside a cargo box or on a basket to create a versatile cargo management system to stow all you need on a bike hiking holiday. If you need to deliver multiple bikes at once, you can use several rooftop bike carriers for that purpose; otherwise, you can use hitch-mounted bike racks to transport up to 5 bikes at once. Before getting bike racks, you need to learn some installation tips and compatibility information; as a result, we recommend a list of articles for building your knowledge on car bike racks.
If you are a fan of winter sporting, you may want to have ski carriers to transport snowboards or skis. However, most people use roof boxes to carry skis or snowboards. It is up to your personal choices. We have a list of ski carriers for your consideration.
Rooftop tents are for camping holidays. You can install a roof tent on crossbars and build a temporary home in the woods or on a beach. Roof tents are big, so you won’t have spare space after mounting one on the car roof. We have a list of roof tents for your consideration.