Trunk comparison: BMW X1 vs Peugeot 308 SW 3-row
Key Differences
The BMW X1 offers a trunk that is 7.5 in (13%) longer than the Peugeot 308 SW (3-row) when the seats are fully folded down. However, with the front row seats upright, the Peugeot has a cargo space that is 7.1 in (20%) longer.
When all seats remain upright, the difference in favor of the BMW becomes even more pronounced: the X1 has a trunk that is 21.7 in (157%) longer than the Peugeot.
In terms of loading dimensions, the Peugeot leads: the trunk opening is 6.7 in (24%) higher, and the depth from the loading edge level to the trunk floor is 0.4 in (33%) greater than in the BMW.
On the other hand, the loading edge on the BMW X1 sits overall 5.9 in (27%) higher above the ground. The width at the narrowest point is the same, and the Peugeot's opening width is only slightly larger (+2.4 in / 6%).
Impact on Usability
For transporting long items with folded seats, the BMW X1 is more advantageous: it offers more cargo length when maximum loading area is desired.
When traveling with more passengers and using the rear rows (all seats upright), the BMW is also significantly more practical because it then provides considerably more trunk space.
The Peugeot scores when it comes to loading with chosen seat configurations and an upright front row: it offers more usable loading length here.
The higher trunk opening and greater depth make it easier to load tall or bulky items and to slide cumbersome cargo over the loading edge. However, the absolute depth difference is only 0.4 in, so the practical gain here may be limited.
The higher loading edge of the BMW makes lifting heavy items into the trunk more strenuous but can help prevent road dirt or water from entering during loading. Since the narrowest width of both models is the same and the opening width differs only slightly, width plays hardly any role in everyday usability.
In short: BMW X1 = more usable length with maximum or full seating; Peugeot 308 SW (3-row) = better handling of tall/bulky cargo thanks to higher opening and slightly greater depth, plus more length in certain seating positions.