Trunk comparison: Kia Stonic vs Opel Grandland

Key Differences (highlighted >10%)

The Opel Grandland offers a significantly longer cargo length: With the seats folded down, the Grandland is 12.6 in (23%) longer, and with the first row upright, it is 7.9 in (29%) longer than the Kia Stonic. This means: for long items or using the full cargo volume, the Grandland provides noticeably more space.

Regarding the trunk depth (loading edge to trunk floor), the Kia Stonic is 0.8 in (13%) higher. Practically, this means slightly more usable interior depth or more storage volume relative to the floor area at the same width.

Impact on Usability

Space for long items: The Grandland clearly has the advantage. Thanks to the significantly greater cargo length, longer items (e.g., slats, fabric by the meter, longer furniture parts, or skis) can be transported more easily without having to improvise by removing seats or placing the load sideways.

For users who regularly transport long cargo, the Grandland is more practical.

Stackability and interior volume: The greater trunk depth of the Stonic positively affects usable volume — with a comparable floor area, it can accommodate more in depth or stack higher. This is useful for bulky, voluminous items that are more "space-consuming" than long.

Loading and unloading: The loading edge height of the Grandland is only 0.4 in higher above the road than the Stonic (1%, not highlighted).

Together with the larger cargo length of the Grandland, this means heavier, long loads can be better accommodated but must be lifted slightly higher when loading. The Stonic offers a slight advantage due to the somewhat lower loading edge for physically easier loading and unloading of heavy items.

Other smaller differences (under 10%) such as the slightly larger opening width of the Grandland (+3.5 in) or the marginally greater narrowest interior width of the Stonic (+1.6 in) have less impact on everyday usability but can make a difference with very wide items or tightly shaped cargo.

Conclusion

Those who frequently transport long items or need the maximum continuous cargo volume are better served by the Opel Grandland.

Those who prefer more usable volume in depth and a slightly easier loading edge height will find advantages in the Kia Stonic. Smaller width and opening differences are situationally relevant but do not change the fundamental usage profile.