Trunk comparison: Audi A4 Avant vs BMW X5

Key Differences

Three differences stand out clearly from the data: The depth of the trunk (loading edge → trunk floor) is +1.6 in (+400%) greater in the Audi A4 Avant, the loading edge of the BMW X5 is +6.3 in (+25%) higher above the ground, and the narrowest width in the trunk is +4.3 in (+11%) larger in the BMW X5. Smaller deviations — such as +1.2 in (2%) in favor of the X5 with folded seats, +0.4 in (1%) in favor of the A4 with the first row upright, +2 in (6%) higher opening in the A4, and +2.8 in (7%) wider trunk opening in the X5 — are present but remain below the 10% mark.

Implications for Usability

The differences clearly affect everyday usability: The significantly greater depth in the A4 Avant creates a deeper cargo space below the loading edge.

This means more usable volume in a deeper “trunk floor” — advantageous for stackable or bulky items that should lie within the loading floor, and for a lower center of gravity of the load. At the same time, reaching into a deeper trunk may require a bit more bending.

The 6.3 in higher loading edge of the BMW X5 makes lifting heavy items from the ground to loading height more demanding; a lower loading edge height (as in the A4) is more ergonomic for regular handling of boxes or shopping bags.

In return, the X5 offers more width at the narrowest point: The 4.3 in larger narrow spot and the overall slightly wider opening make loading wider or bulkier items (e.g., furniture parts, strollers) easier.

In short: the X5 is better for wide, bulky cargo, the A4 Avant is more favorable for low-placed or frequent, ergonomically easier loading.

Those who regularly lift heavy goods will generally benefit more from the lower loading edge setup of the A4; those who often transport wide or unwieldy parts will find the greater interior width of the X5 more useful. Smaller length and opening differences are marginal and hardly affect practical use.