Trunk comparison: Audi A6 Avant vs VW Caddy Wagon

Key Differences
The Audi A6 Avant offers a significantly longer cargo floor with the seats folded down: +31.5 in (+69%) compared to the VW Caddy Wagon. This makes it the clear winner for long items.
The trunk opening of the VW Caddy Wagon is significantly higher: +16.1 in (56%) compared to the Audi A6 Avant. This allows for more height through the opening and makes loading and unloading tall items easier.
The loading edge of the Audi is higher above the ground: +2.8 in (12%) compared to the VW. This makes loading and unloading heavy loads more difficult compared to the Caddy.
The narrowest width in the trunk is 5.1 in (13%) larger in the VW than in the Audi. This gives the Caddy an advantage when transporting wide items.
Other, less important differences: With the first row of seats upright, the Audi is only 3.9 in (9%) longer — here the difference is small. The width of the trunk opening is 3.5 in (9%) larger in the VW, also just a small advantage. The depth of the trunk (loading edge to floor) is the same in both.
Impact on Usability
For long, flat loads (e.g., long slats, skis, furniture parts), the Audi A6 Avant is better suited — the significantly greater lying length with folded seats allows transporting bulky lengths without complicated angles.
For tall or bulky items (e.g., boxes, electrical cases, plants) and for easier lifting of heavy loads, the VW Caddy Wagon has the advantage: the higher trunk opening and the larger narrowest width make it easier to load and place bulky or wide cargo.
The lower loading edge of the Caddy makes loading and unloading more ergonomic and less strenuous.
In everyday use with seat rows upright, the differences are small; the Audi has a slight length advantage, the Caddy scores in height and usable width. The choice therefore depends on the main use: length-oriented transport → Audi A6 Avant; wide/tall or frequent heavy lifting → VW Caddy Wagon.