Trunk comparison: BMW 3 Series Touring vs Kia Stonic

Key Differences

In a direct comparison, it becomes clear: The BMW 3 Series Touring offers significantly more cargo length. Specifically, with the rear seats folded down, the BMW has +15 in (28%) more loading length, and with the front seats upright, even +12.2 in (45%) more.

The Kia Stonic, on the other hand, scores in vertical space utilization and usable width: The depth of the trunk (loading edge to trunk floor) is +6.7 in (1700%) greater in the Kia, the loading edge is +6.7 in (28%) higher above the road, and the narrowest width in the trunk is +3.9 in (11%) larger in the Kia.

Smaller differences: The trunk opening is only 0.4 in (1%) wider in the BMW; the height of the opening in the Kia is +2.8 in (10%), this change is exactly 10% and is not highlighted here.

Impact on Usability

The greater cargo length of the BMW makes it more practical for long items like furniture parts, slatted frames, or skis — both with folded rear seats and with upright seat rows, longer loads can be transported.

The Kia offers more volume vertically due to the significantly greater depth and higher narrowest width, allowing wider or bulkier items to be accommodated sideways in the trunk.

The higher loading edge of the Kia facilitates vertical storage space but also means that heavy cargo must be lifted higher — which can make loading and unloading more strenuous. The BMW has a lower loading edge, which makes lifting heavier loads easier, but the usable interior depth is less.

Conclusion: For transported length and loading long items, the BMW 3 Series Touring is the better choice. For higher volume, somewhat more lateral width, and deeper trunk utilization, the Kia Stonic is better suited — but at the cost of a higher loading edge and thus more effort when lifting.