Trunk comparison: Mercedes Benz GLC vs VW ID.4

Key Differences

The measurable differences between the GLC and ID.4 are mostly small (a few centimeters), with one clear exception: the depth of the trunk (from loading edge to trunk floor) of the VW ID.4 is significantly larger — by 3.9 in or about 900% compared to the Mercedes‑GLC.

All other deviations are under 10%: the GLC has a 2.4 in longer total cargo length with the seats folded down, the ID.4 is minimally longer by 0.4 in with the first row of seats upright.

The trunk opening of the ID.4 is 1.6 in higher, and the loading edge of the ID.4 is 1.2 in higher above the ground. The GLC is 3.5 in wider at the narrowest point in the trunk and its trunk opening is 1.2 in wider than that of the ID.4.

Impact on Usability

The significantly greater depth in the ID.4 means a much deeper cargo area below the loading edge.

Practically, this means: more volume can be used vertically in the ID.4, taller or bulky items can "sink" further in and fit better into the interior, and the deeper floor also offers better storage for irregularly shaped cargo.

However, the loading edge of the ID.4 is slightly higher (+1.2 in), which makes lifting heavy items in a bit more strenuous.

The GLC offers slightly more usable cargo length with the seats folded down and especially a greater width at the narrowest point as well as a wider opening.

This makes the GLC more practical for wide items (furniture parts, wide boxes) and for situations where width is critical. The other smaller length and height differences are usually not noticeable in everyday use.

In short: If you value significantly more vertical depth and thus more cargo volume below the loading edge, the VW ID.4 is advantageous due to the much greater trunk depths. If you more often transport wide items or need a somewhat wider opening, the Mercedes‑GLC is the more practical choice.