Trunk comparison: BMW X5 vs Volvo V90

Summary of Dimension Differences
The Volvo V90 offers a cargo space that is 3.1 in (4%) longer with the seats folded down and 3.9 in (10%) longer with the first row of seats upright compared to the BMW X5. The width of the trunk at its narrowest point is 2 in (5%) greater in the X5, while the width of the trunk opening is 2 in (5%) wider in the V90. The depth (loading edge to trunk floor) differs hardly at all (+0.4 in, 0%).
More significant differences are: The trunk opening of the BMW X5 is 3.9 in (14%) higher than that of the Volvo V90, and the loading edge of the X5 is 7.1 in (30%) higher above the ground than that of the V90.
What are the implications of these differences for usability?
Higher trunk opening (+14%) in the BMW X5: The larger opening dimension makes loading tall items (e.g., boxes, furniture, plants) easier because more vertical space is available. For bulky, tall cargo, the X5 is therefore more practical.
Higher loading edge (+30%) in the BMW X5: The significantly higher loading edge increases the effort required to lift heavy or awkward items into the trunk. Regularly loading heavy cargo is more ergonomic in the V90 because the edge is closer to the ground and the lifting height is lower.
The Volvo V90 offers slightly more cargo length (up to 3.9 in, maximum 10%) and a somewhat wider opening, which facilitates accommodating long or flat items as well as wider parts. However, these advantages are smaller than the differences in opening height and loading edge height.
Conclusion (brief)
For frequent transport of tall or bulky items, the BMW X5 is advantageous due to the higher opening. Those who often lift heavy loads or transport long/flat items and prefer lower lifting heights are usually better served by the Volvo V90 in everyday use.