Trunk comparison: BMW X4 vs VW ID.4

Key Differences

Two differences stand out clearly from the measurements: the VW ID.4 has a 14% larger trunk opening (+3.9 in) and a 25% greater depth between the loading edge and trunk floor (+0.8 in) compared to the BMW X4. Other deviations are smaller: the BMW offers slightly more cargo length (+1.2 in with seats folded down, +3.1 in with the first row upright), but the loading edge of the BMW is about 2 in higher, and the width at the narrowest point and at the opening is slightly larger on the ID.4 (+0.4 in and +1.6 in respectively).

Practical Implications

The higher trunk opening of the ID.4 makes loading tall or bulky items significantly easier — you gain vertical clearance when sliding through boxes, cartons, or furniture parts.

The greater depth between the loading edge and floor means items can be placed further "down," which in practice provides more usable interior height and a somewhat larger capacity for bulky cargo. Both advantages together reduce the risk of bumping at the opening and make stacking taller loads easier.

The BMW X4 scores better with longer items: the slightly greater cargo length (both with folded and upright seats) makes it better suited for long items like slatted frames or skis.

However, the BMW's loading edge is higher, making lifting heavy or bulky loads into the trunk more strenuous. The slightly greater width of the ID.4 is a minor advantage when loading wider parts but is less relevant in practice than the mentioned height and depth differences.

In summary: For frequently transporting tall or bulky cargo, the VW ID.4 is more practical due to the significantly higher opening and deeper loading floor; those who often load long items have an advantage with the BMW X4 but must lift over a higher loading edge more often.