Trunk comparison: BMW i4 vs Mercedes Benz GLC

Significant Differences (>10%) and Their Impact

Four dimensions differ significantly: The trunk opening of the Mercedes‑GLC is 3.5 in (13%) higher than that of the BMW i4. This makes loading tall items easier — less tilting and less risk of catching on the roof edge; bulky, tall cargo can be more comfortably passed through the opening.

The trunk depth (loading edge → trunk floor) is 3.9 in (900%) larger in the BMW i4. Practically, this means significantly more usable interior height behind the loading edge: longer or tall items can be pushed further in, luggage can be stored deeper and more stably.

For long items, stacked boxes, or bulky sports equipment, the i4 has the advantage here.

The narrowest width in the trunk is 8.7 in (25%) larger in the GLC. This means: wider cargo fits more easily in the GLC without bumping at the narrowest cross-section. For wide items (e.g., furniture parts, wide strollers), the GLC is more practical.

The width of the trunk opening is also 6.3 in (17%) larger in the GLC. Combined with the higher opening, this significantly eases loading bulky or wide cargo — less maneuvering, less frequent need to fold down seats.

In summary: The GLC offers clear advantages when loading wide and tall items thanks to a larger opening and more cross-sectional width. The BMW i4 scores with a significantly greater interior depth behind the loading edge, which is especially useful for long or deeply stored items.

Smaller differences in total trunk length (+1–5%) and the minimal difference in loading edge height (+1%) are hardly relevant in practice.