Trunk comparison: Audi Q5 vs BMW X2

Key Message and Main Differences
With the rear seats folded down, the cargo lengths of both models are the same. With the rear seat upright, the Audi Q5 is only slightly longer (+0.8 in / +2%), which is practically negligible.
Three differences are clearly relevant: The height of the trunk opening in the Audi Q5 is 5.1 in (+20%) larger, the usable depth (distance from loading edge → trunk floor) of the BMW X2 is 0.4 in (+13%) larger, and the width of the trunk opening in the Audi Q5 is 5.5 in (+14%) wider.
These differences affect usability as follows: The significantly higher trunk opening and the larger opening width of the Audi Q5 make loading tall and wide items (e.g., furniture parts, large boxes, strollers) easier and gentler — less maneuvering and turning, better pass-through options.
The BMW X2 offers a slightly greater depth, providing a marginally higher usable interior height below the loading edge, allowing longer or low-lying items to be better positioned inside the vehicle.
However, the loading edge of the BMW is somewhat higher above the ground (+2.4 in / +8%), which makes lifting heavy loads over the edge more difficult.
In summary: Those who frequently transport wide or tall cargo clearly benefit from the Audi Q5 (larger opening height and width). Those who benefit more from a slightly deeper cargo well find a small advantage in the BMW X2 but must lift more due to the higher loading edge.