Trunk comparison: Audi Q5 vs Seat Ibiza

Key Differences
The Audi Q5 offers a loading length that is 9.8 in (≈18%) longer with the seats folded down and a loading length that is 10.6 in (≈40%) longer with the first row of seats upright than the SEAT Ibiza.
Additionally, the width of the trunk opening of the Audi Q5 is 9.8 in (≈28%) larger. In contrast, the SEAT Ibiza has a significantly deeper cargo well between the loading edge and the trunk floor (+4.3 in, ≈138%).
Impact on Usability
The longer cargo areas of the Audi Q5 specifically mean more flexibility when transporting long items (e.g., slats, skis, long boxes) and overall more usable cargo volume both with folded and upright seats.
The significantly larger opening of the Q5 makes it easier to load wide or bulky items and reduces maneuvering when loading.
The deeper cargo well in the SEAT Ibiza creates additional volume below the loading edge, which is advantageous for tall or "hidden" cargo, but at the same time, lifting heavy items over the edge can be more difficult and inserting very flat, long items can be more challenging.
Smaller differences (e.g., opening height +1.2 in in the Ibiza, loading edge height +2 in in the Q5, or about +4% narrowest interior width in favor of the Q5) are minor and have limited practical impact on everyday usability.