Trunk comparison: BMW X5 vs Kia Stonic
Key Differences
The biggest differences concern the loading length and trunk depth. Specifically, the trunk of the BMW X5 is 19.3 in (+36%) longer with the seats folded down and 13.8 in (+51%) longer with the first row upright than that of the Kia Stonic.
Additionally, the Kia Stonic has a significantly greater trunk depth: the distance from the loading edge to the trunk floor is 6.7 in (+1700%) larger in the Stonic compared to the BMW X5. Smaller differences: the width of the trunk opening is 3.9 in wider in the BMW, the loading edge in the BMW is 0.8 in higher; height of the opening (+0.4 in) and narrowest width (+2 in) are negligible.
Impact on Usability
More loading length in the BMW X5 means practical advantages for long and bulky items: with folded seats and also with the front bench upright, longer furniture parts, slats, skis, or long boxes can be more easily and fully accommodated.
Those who frequently transport longer items or need more cargo space for moving or handiwork have significantly better options with the X5.
The greater trunk depth (6.7 in) in the Kia Stonic shows that the Stonic has a deeper cargo area below the loading edge.
This creates additional space for bulky or inconspicuous luggage but can make loading and unloading heavy or bulky loads more difficult: items must be lifted over the loading edge and lowered further into a deeper recess.
For regular, heavy loading this is impractical; for occasional storage of bags or shopping bags it is unproblematic and can even be useful, as cargo is less visible.
Other practical points: the 3.9 in wider opening of the BMW makes it easier to load wide items. The 0.8 in higher loading edge in the BMW makes lifting heavy loads minimally more strenuous but usually hardly noticeable in practice. Height of the opening and minor width differences play only a subordinate role.
Conclusion: For transport tasks involving long or bulky items, the BMW X5 is clearly advantageous. For everyday use, shopping, and concealed storage of smaller luggage, the Kia Stonic can be sufficient or even advantageous due to the deeper cargo area, but it clearly loses out to the X5 in length and volume.