Trunk comparison: Audi A6 Sedan vs VW Caddy Wagon

Key Differences
The Audi A6 offers +31.1 in (68%) more length with the seats folded down than the VW Caddy Wagon, while the length difference with the first row of seats upright is only +3.1 in (7%). The trunk opening of the VW Caddy is significantly larger: +25.2 in (128%) higher opening and a wider opening by +7.5 in (20%).
Inside, the Caddy is +4.3 in (11%) wider at the narrowest point than the Audi. In contrast, the Audi stands out with a greater depth between the loading edge and the trunk floor: +3.9 in (500%) in favor of the A6 (percentage high because the starting value is small).
Additionally, the loading edge of the Audi A6 is +3.5 in (16%) higher above the road than the Caddy.
Impact on Usability
These differences lead to clear usage focuses: For long, flat loads (e.g., longer slats, boards, or flat-packed furniture), the Audi A6 is advantageous thanks to the significantly greater interior length with folded seats and the larger interior depth.
For bulky, tall, or wide-shaped items as well as for easy loading and unloading, the VW Caddy Wagon scores: its much higher and wider trunk opening and the greater minimum width make it easier to load large, voluminous parts; the lower loading edge makes heavy lifting easier.
The slightly longer trunk length of the A6 with the first row of seats upright (+3.1 in / 7%) is marginal and has little impact in everyday use.