Trunk comparison: Mercedes Benz GLB vs Peugeot 3008

Key Differences
The trunk opening of the Mercedes‑Benz GLB is 3.9 in (13%) higher than that of the Peugeot 3008. The loading sill of the Peugeot 3008 is 3.1 in (11%) higher above the ground than that of the GLB.
Other, smaller differences: With the seats folded down, the GLB is 3.9 in (6%) longer; with the front row upright, the 3008 is 1.6 in (4%) longer. The trunk depth (tailgate to floor) is 0.4 in (9%) greater in the GLB. The narrowest trunk width and the opening width are each 1.6 in (4%) larger in the GLB.
Impact on Usability
The higher trunk opening of the GLB makes loading tall or bulky items (e.g., furniture, tall boxes) easier and reduces the risk of hitting the upper edge. This is a clear advantage when frequently transporting large, tall items.
The significantly higher loading sill of the 3008 means luggage or heavy items must be lifted higher. This increases the effort required for loading and unloading and makes handling less comfortable during frequent cargo changes.
The other differences (length and width advantages of the GLB with folded seats, slightly more interior length in the 3008 with upright seats) are marginal and only slightly affect everyday practicality: The GLB offers slightly more cargo volume when folding the seats and can accommodate somewhat wider loads, while the 3008 has a minimal advantage for longer luggage behind the rear seat when seats are upright.
Conclusion
For frequent transport of tall or bulky items and ergonomically easier lifting, the Mercedes‑Benz GLB is better suited due to the higher opening and generally somewhat more generous dimensions.
Those who mainly drive with the rear seat upright and regular trunk access with lighter cargo will find the Peugeot 3008 a viable alternative but must accept a higher loading sill.