Trunk comparison: BMW i4 vs Seat Ibiza
Trunk Length and Cargo Volume
The BMW i4 offers significantly more length in the cargo area: with the seats folded down it is +13.8 in (≈25%) longer, and with the front row upright even +11.8 in (≈44%) longer than the SEAT Ibiza.
Practically, this means the i4 accommodates longer items (skis, slats, longer boxes or furniture parts) much better and remains more flexible for daily luggage even when the seats are not folded down.
Loading Height and Trunk Depth
The SEAT Ibiza has a higher trunk opening and a significantly deeper loading floor: the opening is +5.9 in (≈22%) higher and the depth from the loading edge to the trunk floor is +3.5 in (≈90%) greater than in the BMW i4. Practical consequences: The higher opening makes it easier to load tall items (large crates, boxes, plants), and the greater depth means more usable interior height/vertical depth in the cargo area.
At the same time, a lower loading floor (greater distance loading edge→ground) can facilitate sliding in longer or bulkier items but requires a bit more lifting effort over the loading edge when handling heavy objects.
Width and Trunk Opening
At the narrowest point, the SEAT Ibiza is +4.3 in (≈13%) wider than the BMW i4, allowing wider items to fit better inside. The width of the trunk opening is, however, 2.4 in (≈7%) larger on the BMW i4 — this is a smaller advantage and below the 10% threshold.
Practically, this means: The Ibiza offers more space inside at critical points for bulky cargo, while the i4 allows somewhat easier insertion of large parts at the opening, though the effect is less pronounced.
Small Differences
The loading edge of the BMW i4 is only about 0.4 in (≈1%) higher above the road than that of the Ibiza — this is negligible in practice and hardly affects loading.
Summary — Usability
For long items and more usable loading length, the BMW i4 is clearly advantageous. For tall, bulky, or particularly wide cargo (in tight spots), the SEAT Ibiza offers more practical benefits through a higher opening, greater depth, and more width at the narrowest point.
The choice depends on typical cargo: i4 for length and transport flexibility; Ibiza for height, interior width at narrow points, and good handling of bulky items.