Trunk comparison: Audi A4 Avant vs Mercedes Benz GLC

Key Differences (Summary)

In the trunk, the Audi A4 Avant shows several significant advantages over the Mercedes‑GLC: with the front seats upright, the A4's trunk is 12% (≈+5.1 in) longer, the height of the trunk opening is 12% (≈+3.5 in) larger, and the depth measured from the loading edge to the trunk floor is 400% (≈+2 in) greater.

In contrast, the Mercedes‑GLC offers a greater width at the narrowest point: 11% (≈+4.3 in) wider. Other differences: with the seats folded down, the A4 is about 5% (≈+3.1 in) longer, the opening width of the GLC is about 8% (≈+3.1 in) larger, and the GLC's loading edge is ≈13% (≈+3.1 in) higher above the road.

Impact on Usability

The longer cargo floor of the A4 with the normal seating configuration (≈+13%) makes it more practical for longer items when not all seats need to be folded down (e.g., skis, slats, long boxes).

The higher opening height of the A4 (≈+3.5 in) makes it easier to load tall or bulky items – more headroom when loading and better access for tall cargo.

The significantly greater depth from the loading edge to the trunk floor in the A4 (the stated relative difference is very large) practically means more usable volume "below" the loading edge: items sit deeper and protrude less, smaller cargo is less likely to slip out of sight, and with a flatter floor, folding distances are shorter.

Combined with the lower loading edge of the A4 (GLC loading edge is ≈+3.1 in higher), lifting heavy items into the A4 is generally less strenuous than into the GLC.

The GLC scores points in width: the greater narrowest width (≈+4.3 in) as well as the slightly wider opening make it easier to store wide items (e.g., furniture parts, wide boxes) and provide more lateral room when loading.

The higher loading edge of the GLC can be disadvantageous when loading heavy loads but is practical for vehicles with an open cargo area (SUV character) when loading briefly from ground level.

In summary: For long and tall cargo as well as easier lifting of heavy items, the Audi A4 Avant is more advantageous in everyday use. For very wide cargo, the Mercedes‑GLC offers better conditions.

Smaller differences (e.g., total length with fully folded seats or the slightly larger opening width of the GLC) are less decisive in everyday life but can be relevant depending on the intended use.