Trunk comparison: Audi A6 Sedan vs VW Passat Wagon

Key Differences
In a direct comparison, three significant differences emerge: The height of the trunk opening of the VW Passat Wagon is 11.4 in (58%) larger than that of the Audi A6. The depth of the trunk (loading edge to trunk floor) in the Audi A6 is 1.2 in (33%) larger than in the Passat.
Additionally, the width of the trunk opening in the VW Passat Wagon is 4.3 in (12%) wider than in the Audi A6. Smaller deviations (length with folded seats +2.4 in/3%, trunk with upright first row +0.8 in/2%, loading edge height +0.8 in/3%, narrowest width +0.4 in/1%) are relevant in practice but significantly less pronounced.
Impact on Usability
The significantly higher trunk opening of the Passat (58%) makes loading and unloading tall or bulky items much easier: boxes, crates, or pieces of furniture can be loaded upright without tilting. This reduces limitations when transporting tall cargo and makes lifting larger parts easier.
The wider opening width of the Passat (+12%) increases the chance of sliding wide items directly into the trunk without turning them. This is advantageous when transporting wide boxes, bulky sports equipment, or furniture parts.
The greater depth of the Audi A6 (+33%) ensures that longer items can be better accommodated lying flat and the usable cargo area in front of the loading edge appears larger. For longer, relatively flat cargo (e.g., slats, panels, skis in extended condition), the A6 is therefore more practical.
In practice, these differences mean: Those who frequently transport tall or wide items are better served by the Passat Wagon.
Those who more often need to safely and deeply store long, flat cargo in the trunk have advantages with the Audi A6. The remaining differences are minor and only marginally affect everyday usability.