Trunk comparison: Citroen C3 vs Kia Stonic

Key Differences

Two differences stand out clearly from the data: The depth of the trunk (loading edge to trunk floor) is +2 in (28%) greater in the Citroën C3 than in the Kia Stonic.

The width of the trunk opening is +4.3 in (13%) greater in the Kia Stonic than in the Citroën C3. All other differences are less than 10% (length differences 1–3%, narrowest width +9%, loading edge height +1% or equal opening height) and thus rather small.

Impact on Usability

The greater trunk depth measurement in the Citroën C3 practically means more vertical space or a deeper cargo compartment behind the loading edge. This increases the usable volume for bulky or tall items and allows better stacking of suitcases or boxes.

However, a deeper interior can make loading/unloading heavy items slightly more difficult because access is further inside; combined with the minimally higher loading edge (only +0.4 in), the extra effort when lifting is low.

The significantly wider trunk opening in the Kia Stonic makes loading and unloading wider items much easier: wide crates, strollers, or bulky boxes can be pushed in more easily and need to be turned or tilted less often.

Even though the narrowest interior width in the Stonic is just under the 10% mark (+3.5 in), the wider opening greatly supports handling large cargo areas.

Since length differences are very small (Kia minimally longer with seats folded/unfolded) and the opening heights are equal, these aspects usually have no noticeable effect in practice.

In summary: Citroën C3 offers more depth/vertical space for stacking and tall loads; Kia Stonic is more practical for wide or bulky cargo due to the larger opening. The choice depends on whether you more often stack vertically or need to load wider items.