Trunk comparison: Mercedes Benz GLB vs Peugeot 308 SW 3-row

Key Differences (highlighted >10%)

The Mercedes‑Benz GLB offers a significantly longer cargo space with the seats folded down: +12.6 in (22%) compared to the Peugeot 308 SW. With all seats upright, the GLB's advantage is even more pronounced: +23.6 in (171%).

The trunk depth (loading edge to trunk floor) of the GLB is +3.1 in (200%) greater, and the loading edge itself sits +6.3 in (29%) higher above the road in the GLB.

What this means for usability

Space and flexibility: The GLB is overall more practical when a lot of storage space with upright seats or large cargo volume with folded seats is needed. The large length advantages mean that longer luggage or bulky loads can be transported more easily in the GLB without having to remove seats.

Vertical space and loading floor: The significantly greater depth of the GLB provides more usable volume behind the loading edge and allows for accommodating taller or bulkier items in the trunk. This is especially advantageous for families with strollers, camping gear, or bulky shopping.

Loading situation and ergonomics: The higher loading edge of the GLB (+6.3 in) makes lifting heavy items into the vehicle more difficult compared to the Peugeot. Those who frequently load heavy boxes or furniture will prefer the easier loading of the Peugeot.

Practical consideration: The Peugeot scores only in a few smaller aspects (e.g., slightly higher trunk opening and larger opening width), and it has a small but noticeable length advantage of +5.1 in (14%) with the first row upright, which can be useful in certain configurations (e.g., transporting long, flat items without folding other seats).

Overall, the GLB is the better choice when it comes to pure cargo volume and flexibility; the Peugeot is ergonomically easier to load and slightly more favorable in some installation situations.