Trunk comparison: Audi Q3 vs BMW X4

Key Differences and Their Impact on Usability

Both models are overall similar, but three differences clearly stand out from the measurements: The BMW X4 offers a cargo floor that is 4.7 in (13%) longer with the rear seats upright, while the Audi Q3 has a trunk opening that is 3.1 in (11%) higher and the depth between the loading edge and trunk floor is 0.4 in (13%) greater in the Audi.

Practically, this means: With full occupancy (rear seats up), the X4 can transport longer items — suitcases, skis, or longer boxes can be more easily placed on the floor without folding the seats down.

The greater opening height of the Q3, on the other hand, makes it easier to load tall or bulky items in the upright position (e.g., boxes, plants, bulky luggage) because more vertical space is available.

The greater depth (even if nominally only 0.4 in) gives the Q3 slightly more floor space directly behind the loading edge, which can stabilize the position of items and provide a small extra length for flat loads.

Other, smaller differences: The loading edge of the BMW is about 1.6 in higher above the road surface, making it somewhat more strenuous to lift heavy loads in; the narrowest width is the same for both, and the opening width is 3.5 in larger on the Audi (but that is under 10% and thus only a moderate advantage).

Overall: Those who often transport long items with passengers have an advantage in the X4; those who frequently load tall or bulky parts into the trunk or value easier handling when loading benefit from the Audi Q3.