Trunk comparison: Audi A3 Sportback vs Kia Stonic

Key Differences (highlighted: >10%)

Three differences stand out in cargo volume and loadability: The Audi A3 Sportback offers a longer trunk space by +3.1 in (≈12%) with the first row of seats upright compared to the Kia Stonic.

The Kia Stonic, on the other hand, has a deeper trunk floor (distance from loading edge → trunk floor) by +0.8 in (≈13%) and a higher loading edge above the road by +3.9 in (≈15%) compared to the Audi.

Other smaller deviations: Audi is slightly longer with the fully folded cargo floor (+4.7 in / 9%), the Kia has +2.4 in (6%) more width at the narrowest point, and the opening is +0.8 in (2%) wider.

Impact on Usability

The longer trunk space of the Audi with the seat row upright makes transporting long items (e.g., slats, skateboards, skis) easier without folding down seats.

The lower loading edge of the Audi (since the Kia is about 3.9 in higher) makes loading and unloading heavy or bulky items easier — less lifting force and less strain on the back.

The deeper trunk of the Kia means items can be set further down into the trunk; this positively affects usable interior volume for bulky but not very long cargo (e.g., boxes, shopping bags).

However, the higher loading edge of the Kia is a disadvantage when lifting heavy loads: more effort and inconvenient for repeated loading. The slightly greater minimum width and opening width of the Kia make it easier to load wider items but only marginally.

Practical Recommendation

For users who frequently transport long items or prefer easier lifting, the Audi A3 Sportback is more advantageous. Those who need more depth in the trunk and a bit more width (and can tolerate the higher loading edge) will find practical benefits in the Kia Stonic.