Trunk comparison: Audi A6 Sedan vs Volvo XC40

Key Differences
The Audi A6 offers significantly more cargo length: with the seats folded down, the trunk of the A6 is 10.6 in (16%) longer, and with the first row upright, even 9.4 in (26%) longer. The depth of the trunk (loading edge to trunk floor) is 4.7 in (1100%) greater in the Audi.
The Volvo XC40, on the other hand, has a significantly higher trunk opening (+9.1 in / 46%) and a larger opening width (+4.7 in / 13%). Additionally, the loading edge of the Volvo is 3.5 in (14%) higher above the road. The narrowest interior width differs by only 0.4 in and is therefore negligible.
Impact on Usability
Due to the greater length and depth of the Audi A6, long or flat items can be stored better and flatter (e.g., skis, furniture parts, multiple suitcases).
The deeper loading area offers more usable storage space and allows stacking luggage under the edge. The lower loading edge of the A6 also reduces the effort required to lift heavy loads into the trunk.
The Volvo XC40 is advantageous when it comes to loading and unloading tall or bulky items: the significantly higher opening and larger opening width make it easier to load bulky, tall objects (e.g., plants, boxes, strollers in upright position).
However, the higher loading edge makes lifting heavy loads from road/ground level more difficult compared to the Audi.
For users who frequently transport long or numerous pieces of luggage, the Audi A6 is more practical. Those who often need to carry tall, bulky items or require quick frequent access through the trunk opening will find advantages in the Volvo XC40.