Trunk comparison: Audi A3 Sportback vs Mercedes Benz GLC

Key Differences

The Mercedes‑Benz GLC offers a longer cargo floor by +10.2 in (17%) with the seats folded down and a longer trunk length by +6.3 in (21%) with the first row upright compared to the Audi A3 Sportback.

The width of the trunk at its narrowest point is +4.3 in (11%) greater in the GLC, and the width of the trunk opening is +5.1 in (13%) larger. The vertical depth between the loading edge and the trunk floor is significantly greater in the Audi A3: +6.3 in (1500%) compared to the GLC.

Impact on Usability

The longer cargo floor of the GLC (both with folded seats and in the normally occupied state) clearly makes it better suited for long items such as boards, bicycles, or furniture parts without needing to remove the seats completely.

The greater width in the trunk and the wider opening make loading bulky or wide cargo easier – bulky boxes, strollers, or wide luggage can be accommodated more easily in the GLC.

The Audi A3 scores with the significantly greater depth between the loading edge and the trunk floor: this creates a deeper cargo area or "cargo funnel," which is suitable for tall or stacked cargo (more vertical volume) and securely stores smaller items below the loading edge.

Additionally, the loading edge in the A3 is slightly lower (not highlighted), which makes lifting heavy loads easier.

In summary: For long and wide or bulky loading tasks, the GLC is the more practical choice. For deeper, stackable luggage and easier lifting of heavy items, the A3 offers advantages. Which option fits better thus depends on the typical cargo (long/wide vs. tall/stacked) and the ease of loading.