Trunk comparison: Kia Stonic vs Mercedes Benz GLB

Key Differences

The Mercedes‑Benz GLB offers a 15.7 in (29%) longer cargo area with the seats folded down than the Kia Stonic, and with the first row of seats upright, the GLB is even 10.2 in (38%) longer.

The trunk opening of the GLB is 3.5 in (11%) higher than that of the Stonic. In contrast, the Kia Stonic has a significantly deeper trunk floor relative to the loading edge: 2.4 in (50%) deeper than the GLB.

Impact on Usability

Due to the significantly greater length of the GLB (both with folded seats and with the first row upright), longer items such as skis, boards, long furniture parts, or several large boxes can be transported more easily.

The higher trunk opening of the GLB also makes it easier to fit taller or bulky items, as they can be maneuvered more easily through the opening.

The deeper trunk floor of the Stonic means more interior height below the loading edge and can favor stacking higher piles or bulky items in the floor area. Practically, this means: the Stonic is better suited for lower-lying, stackable cargo or when items should not extend above the loading edge.

At the same time, a deeper floor usually requires more range when lifting or lowering heavy items into the vehicle interior, which can make loading more laborious.

Smaller differences, such as the slightly higher loading edge of the Stonic (+2 in / 7%) or the 2.8 in (7%) wider opening width of the GLB, exist but fall below the 10-percent mark and only slightly affect everyday usability: the higher loading edge makes lifting minimally more strenuous, while the GLB’s few centimeters wider opening slightly eases inserting especially wide items.

Conclusion: For transporting long or tall and bulky items, the GLB is clearly better suited. The Stonic offers advantages through the deeper trunk floor for stacking and lower-lying cargo but is less practical when loading heavier or very long items.