Trunk comparison: BMW X4 vs Tesla Model 3
Key Differences (highlight >10%)
Three measurements differ significantly: The trunk opening of the BMW X4 is 7.1 in (≈35%) higher than that of the Tesla Model 3, the loading height (loading edge above road) of the BMW X4 is 4.7 in (≈18%) higher than the Tesla, and the depth of the trunk (loading edge to trunk floor) of the Tesla Model 3 is 1.2 in (≈38%) deeper or "lower positioned" than the BMW.
What impact do these differences have on usability?
Higher trunk opening on the BMW X4 (+35%): The larger opening makes it easier to load tall or bulky items (e.g., larger boxes, plants, tall furniture parts) vertically. However, combined with the higher loading edge, this also means such items must be lifted higher to fit through the opening.
Higher loading edge on the BMW X4 (+18%): The greater height above the road makes lifting heavy or large items into the trunk more difficult (more effort or lifting required).
For wheeled luggage, a higher step-in is also less favorable. The Tesla with its lower loading edge is more ergonomic for loading heavy loads and for loading with rolling suitcases or shopping trolleys.
Deeper trunk floor on the Tesla Model 3 (+38% depth relative to BMW): The deeper cargo space increases the usable volume effect and allows items to be pushed further back; this improves storage space for long or flat loads.
At the same time, items sit lower and are somewhat harder to reach, especially small items on the trunk floor. Combined with the lower loading edge, this makes loading large quantities or heavy items ergonomically easier.
Smaller differences (not highlighted: <10%): Tesla has slightly more loading length with folded seats (+5.9 in, 9%) and slightly more length with the first row upright (+2 in, 5%).
The BMW is marginally wider at the narrowest point and in opening width (+2 in and +1.2 in respectively). These differences affect handling of wide but not very large items and are less significant in practice than the three values mentioned above.
Practical Conclusion
If you frequently need to transport tall/bulky items vertically (e.g., plants, tall boxes), the BMW X4 offers a clear advantage due to the higher opening—despite the higher loading edge.
If you often load heavy or wheeled luggage or value easier lifting and a deeper, well-usable cargo space, the Tesla Model 3 is better suited due to the lower loading edge and deeper trunk. For long items with folded seats, the Tesla offers slightly more length; the width slightly favors the BMW but only marginally.