Trunk comparison: Audi A6 Sedan vs Audi Q7

Key Differences
The biggest differences concern the height and width of the opening as well as the position of the loading edge and trunk floor.
In detail: the trunk opening of the Audi Q7 is 9.8 in (50%) higher than that of the A6, the width of the Q7's trunk opening is 10.6 in (29%) larger, and the loading edge of the Q7 is 4.7 in (18%) higher above the road.
In contrast, the Audi A6 has a significantly greater depth between the loading edge and trunk floor — the A6 is 4.7 in (1100%) “deeper” here.
Smaller differences (trunk length with folded seats +3.1 in / 4% and with upright first row +1.6 in / 3%; narrowest trunk width +2.4 in / 6%) are below the 10% threshold and are not highlighted here.
Impact on Usability
The significantly higher and wider opening of the Q7 makes loading and unloading large, tall, or bulky items noticeably easier: bulky boxes, cartons, furniture pieces, or sports equipment can be loaded and unloaded more easily because there is more vertical space and a wider entry zone available.
At the same time, the higher loading edge of the Q7 increases the lifting effort when hoisting heavy loads — especially without lifting aids or ramps, loading heavy items is more strenuous than in the A6.
The deeper trunk floor of the A6 (greater depth between loading edge and floor) and the overall lower loading edge mean less lifting from the road to the trunk floor.
This makes lifting heavy items more comfortable and reduces back strain during regular loading (groceries, toolboxes, heavy boxes). However, the trunk opening in the A6 is lower and somewhat narrower, so especially tall or very wide items may not fit as easily as in the Q7.
Since the length differences are very small, the usable cargo length in the longitudinal direction is largely comparable in both models.
Practically, this means: those who frequently transport wide or tall cargo (furniture, large boxes, bulky sports equipment) benefit from the Q7; but those who often lift heavy loads alone and value a low loading height will find the A6's trunk more practical.