Trunk comparison: Kia Sportage vs Mercedes Benz GLB

Key Differences (Summary)

The Mercedes‑Benz GLB offers two notable advantages over the Kia Sportage: the height of the trunk opening is 5.9 in (21%) larger and the trunk depth (distance from loading edge to trunk floor) is 4.7 in (1100%) greater. These two differences have the strongest impact on the practical use of the cargo space.

What These Differences Mean in Practice

The GLB's trunk opening, which is 21% higher, makes loading tall or bulky items significantly easier: bulky boxes, strollers, or furniture fit more easily lengthwise into the opening, the risk of hitting the headliner while loading decreases, and handling is overall more comfortable.

The significantly greater depth (loading edge→floor distance) in the GLB means more usable volume below the loading edge. Advantages include a deeper cargo area where luggage or groceries can lie deeper and thus more securely (lower center of gravity) and can be stacked better.

Disadvantages include deeper access: items on the floor require more bending or reaching down, and unloading can be ergonomically more demanding—especially with heavy loads.

Other, Smaller Differences

The differences in trunk length with folded seats (+3.1 in / 5%) and with the first row upright (+2 in / 6%) are minor and hardly affect everyday usability.

Width at the narrowest point and width of the trunk opening are practically the same, each with +0.4 in (≈1%). The loading edge height of both models is identical, meaning lifting luggage onto the loading edge does not differ.

Conclusion

Those who frequently load tall or bulky items or appreciate more usable volume below the loading edge will noticeably benefit from the Mercedes‑Benz GLB in everyday use. For users who primarily need ergonomic access to the trunk floor or only occasional loading, the differences are less relevant in daily life.