Trunk comparison: Mercedes Benz GLB vs Seat Leon

Key Differences

The most significant differences concern cargo space and interior dimensions: The Mercedes-Benz GLB offers a 11 in (19%) longer cargo area with seats folded down and a 4.7 in (14%) longer cargo area with the first row of seats upright compared to the SEAT Leon.

At its narrowest point, the GLB is also 9.4 in (30%) wider. Conversely, the SEAT Leon differs significantly in the depth between the loading edge and the trunk floor: this is 5.1 in (108%) greater in the Leon than in the GLB.

Impact on Usability

Volume and Length (GLB): The longer cargo areas of the GLB — both with seats folded down and upright — make it more practical for long items (e.g., skis, furniture parts) and for transporting multiple large suitcases.

The greater narrowest width improves storing wide boxes or bulky cargo and facilitates loading organization.

Depth/Loading Situation (SEAT Leon): The significantly larger distance between the loading edge and the trunk floor in the Leon indicates a deeper cargo space behind the loading edge.

This can be advantageous for storing lower items or hidden storage volumes beneath the loading edge, but it changes the handling when loading: a greater height difference often means more lifting effort when placing heavy parts and can make sliding in or out flat cargo more difficult.

Smaller Differences: The GLB's trunk opening is 3.1 in (10%) higher, which can make loading tall items easier (threshold 10% — not highlighted as primary).

The Leon has a slight advantage in opening width by 1.2 in (3%) and a 1.2 in (4%) higher loading edge above the road; these differences are minor and only moderately affect practical use.

Conclusion: For maximum flexibility in transporting long or wide items and for family- or travel-friendly use, the GLB has the advantage. The Leon offers special storage options due to the greater depth behind the loading edge but requires more effort when handling heavy or flat parts.