Trunk comparison: Kia Stonic vs VW ID.4

Key Differences

The VW ID.4 offers a significantly longer cargo area: with the seats folded down, the trunk is 12.6 in (23%) longer, and with the front row upright, it is even 9.8 in (36%) longer than the Kia Stonic.

Another significant difference in the Kia is the depth between the loading edge and the trunk floor, which is 3.1 in (80%) greater than in the ID.4.

Impact on Usability

The longer cargo area of the ID.4 makes it more practical for longer items and bulky loads, especially when the rear seats are folded down or longer parts need to be transported with the seats upright. The greater length dimension thus facilitates transport tasks where depth/horizontal dimensions are crucial.

The greater distance between the loading edge and the trunk floor in the Kia Stonic means that the trunk floor sits relatively deeper.

Combined with the only slightly higher loading edge of the Kia (1.2 in), it results in the trunk floor of the Stonic being about 2 in lower than in the ID.4. Practically, this means: despite the higher loading edge, lifting heavy items into the Kia is overall somewhat less high (lower lift) and there is more usable vertical depth inside.

In practice, this means: those who frequently transport long items or many bulky parts (e.g., long slats, furniture parts) are better served by the ID.4. Those who often lift heavy, compact loads or rely on a lower interior floor height (easier loading, better vertical stackability) benefit from the Kia Stonic.