Trunk comparison: Audi A6 Sedan vs Mercedes Benz GLB

Key Differences

The Audi A6 offers a +7.9 in (≈21%) longer trunk with the front seats upright compared to the Mercedes-Benz GLB. This makes the A6 noticeably more advantageous for longer, flat cargo when the rear seats are not folded down.

In contrast, the Mercedes-Benz GLB has a significantly larger trunk opening: the opening height is +15 in (≈76%) higher and the opening width is +4.7 in (≈13%) wider than the A6. These differences greatly improve loading bulky or tall items.

Practically, this means: For long items like skis, slats, or long furniture parts, the A6 is better suited because it offers more usable cargo length with the seats upright.

The GLB is preferable when regularly transporting bulky, tall, or wide items — the larger opening makes maneuvering bulky cargo and loading strollers, boxes, or larger suitcases easier.

Additional usability points: Depth (loading edge to trunk floor) is the same in both models, and the narrowest width differs only slightly (+1.2 in in the GLB).

The GLB's loading edge is 2.4 in (≈9%) higher than the A6's, which makes lifting heavy items a bit more strenuous but was not highlighted among the main (>10%) differences.

Conclusion

If the primary transport requirement is length (long, flat cargo), the Audi A6 is the more practical choice. For frequent loading of tall or wide items, more comfortable handling during loading and unloading, and better accessibility, the Mercedes-Benz GLB is recommended.