Best roof box on the market — and why a back box might beat them all

If you're shopping for a roof box, there are many great options on the market today. But before you commit, it’s worth comparing the pros and cons — and considering whether a back box (rear mounted cargo box) might actually be the smarter solution for your needs.

Top roof box examples to know

Here are a few highly regarded roof boxes currently available:

• Thule Force XT – A well-balanced all-around choice, known for ease of installation and dual-side opening.

• Thule Motion 3 – Premium, aerodynamic design, often praised in reviews for quiet performance.

• Twinny Load – Large capacity for bigger loads.

These are just a few examples, brands like Thule, Yakima, INNO, GHI, and others appear frequently in “best of” reviews. 

What these roof boxes do well

• They expand storage beyond your trunk.

• Many offer aerodynamic shapes, dual-side openings, and secure locking systems.

• They integrate with roof racks, letting you keep your interior clear for passengers.

In reviews, models like Thule Motion XT, INNO Wedge, Thule Vector are often top performers in terms of usability, durability, and design. 

The limitations and challenges

Even the best roof boxes have trade-offs:

1. Increased drag & fuel cost
   Roof boxes disrupt the natural airflow over your car. Many tests show a roof box can increase drag by as much as 30–40%. That extra resistance means more fuel use (or reduced range for EVs). 

2. Wind noise
   Even aerodynamic models generate turbulence, especially at highway speeds. That hum or whistle can degrade your comfort on long trips.

3. Accessibility hassles
   Putting heavy or long items up there means lifting them overhead. In bad weather, darkness, or snow, that becomes risky.

4. Installation complexity
   You need roof rails or crossbars. Mounting/unmounting may require tools. Some configurations don’t allow full trunk access.

5. Impact on handling & stability
   Adding weight high up raises your center of gravity, which can affect cornering or crosswind behavior, especially with full loads.

Why a back box often outperforms even the best roof boxes

While roof boxes have their place, a rear mounted cargo box (back box) addresses many of the above drawbacks. Here's how:

• Lower drag / better aerodynamics
  A well-designed back box follows the vehicle’s rear shape. Properly mounted, it can reduce drag compared to adding a roof box — some reports claim up to ~5% improvement in aerodynamic efficiency over a roof-mounted solution.

• Quieter ride
  Behind the car, turbulence is reduced, resulting in a more peaceful cabin, especially at high speeds.

• Waist-level access
  Loading and unloading is far easier and safer. No climbing, no heavy lifting overhead.

• Better stability
  Because the added weight is lower and closer to the chassis, the handling impact is less severe compared to a roof box.

• Universal installation
  Back boxes mount to a towbar, so you avoid the need for roof rails and crossbars. This makes them compatible with many vehicles—including some that lack roof racks.

• Preserve vehicle lines
  Without a bulky box on top, your car retains its original profile, and no added wind penalties on top.

Final reflections

Yes, there are excellent roof boxes on the market, but for many users, especially those who care about comfort, efficiency, safety, and aesthetics, a back box might just be the better option.