Trunk comparison: Mercedes Benz GLB vs Durchschnitt Subcompact

Key Differences

The most significant differences concern the length and opening width of the cargo area: The Mercedes‑Benz GLB offers a 19.3 in (38%) longer cargo floor with the seats folded down and a 12.6 in (51%) longer depth with the first row of seats upright compared to the average subcompact.

Additionally, the width of the trunk opening on the GLB is 5.9 in (16%) larger.

In contrast, the average subcompact has a significantly greater depth between the loading edge and trunk floor — 2.8 in (58%) more —; other differences (opening height +2.8 in / 9%, narrowest interior width +2.8 in / 7%, loading edge height +0.4 in / 1%) are comparatively small.

Impact on Usability

These differences lead to clear usage profiles: The significantly greater cargo length of the GLB (with and without folded seats) makes it better suited for long items like skis, boards, or furniture parts, as well as for more luggage on family trips.

The 5.9 in wider trunk opening makes loading bulky or wide luggage easier and reduces the hassle when stowing.

The greater depth (loading edge→floor) in the average subcompact means the cargo floor extends further "downwards" — advantageous when you want to use volume below the loading edge or stack items more compactly.

However, this deeper well can make lifting heavy loads in more difficult. The GLB offers less depth profile here but compensates with length and a wider opening.

In short: For long and wide cargo as well as flexible family use, the GLB is clearly advantageous. If the requirement is more for a deep, low-placed storage space for compact stacking, the average subcompact can offer benefits.

Smaller differences (opening height, narrowest width, loading edge height) have little practical impact.