Trunk comparison: BMW X1 vs Kia Stonic

Key Differences

The BMW X1 offers a cargo space length that is 10.6 in (20%) longer with the seats folded down and a cargo space length that is 8.3 in (30%) longer with the first row of seats upright compared to the Kia Stonic.

On the other hand, the Kia Stonic has a significantly greater trunk depth (loading edge to trunk floor) – +5.9 in (500%).

Other differences: the Kia's trunk opening is 2.8 in (10%) higher, the loading edge is 2.4 in (8%) higher, the narrowest width inside the trunk is 1.6 in (4%) larger in the Kia, and the width of the trunk opening is 3.1 in (8%) larger in the BMW.

Impact on Practical Use

The longer cargo space in the BMW X1 makes it clearly better suited for long or flat loads such as furniture parts, long boxes, skis, or bulky items that need to be transported lengthwise. Those who regularly carry long items or need a lot of usable length have a clear advantage with the X1.

The greater trunk depth of the Kia Stonic means more space below the loading edge – this can create more usable volume for deep or bulky items and allows for deeper storage of luggage if needed.

However, this depth comes with a higher loading edge: the Kia has a loading edge that is 2.4 in higher, which makes lifting heavy items into the trunk more strenuous.

The slightly larger opening width of the BMW (+3.1 in) makes it easier to load wider items through the rear opening. The slightly larger narrowest interior width of the Kia (+1.6 in) exists but the difference is small and usually secondary compared to length and depth.

Conclusion

For longer, flat-lying, or wide items, the BMW X1 is the more practical choice. If deeper storage and a larger volume in the trunk floor area are important (while being willing to accept heavier lifting at a higher loading edge), the Kia Stonic offers advantages.