Trunk comparison: Audi A3 Sportback vs VW ID.4

Key Differences (highlighted: >10%)

The VW ID.4 offers +7.9 in (13%) longer cargo space with folded seats and +6.7 in (22%) longer cargo space with the front row upright, providing significantly more usable loading length than the Audi A3 Sportback.

In contrast, the Audi A3 has a considerably greater trunk depth: the depth (loading edge → trunk floor) is +2.4 in (60%) larger than in the ID.4.

Impact on Usability

The longer cargo spaces of the ID.4 make it more practical for everyday use with long or bulky items (e.g., furniture parts, skis, long boards) and increase the actual cargo volume, especially when the rear seats are folded down.

The greater length with the front row upright also means more room for luggage or shopping without constantly folding seats.

The greater depth of the A3 (the trunk floor sits lower relative to the loading edge) creates more vertical space below the loading edge. This is advantageous when items need to be stored “recessed” or when small items should be kept out of sight; it can also provide better support for low-placed cargo.

However, a deeper floor at the same loading edge height reduces the usable length above the edge and can make pulling out heavy, flat loads more difficult.

Other relevant points: The loading edge of the ID.4 is slightly higher above the road (+2.8 in, 10%) and the trunk opening is wider (+3.9 in, 10%) — both facilitate positioning large items but can make lifting heavy loads into the vehicle more challenging.

Smaller width differences at the narrowest point (+0.8 in) and the slightly higher opening height (+1.2 in) are practical but less decisive.

Conclusion: For frequent transport of long or bulky items, the VW ID.4 is the more practical choice. For users who prefer a lower loading edge and more “recessed” storage space (e.g., for secure storage of smaller items), the Audi A3 may be more suitable — though with less overall length in the cargo area.