Trunk comparison: BMW X3 vs Peugeot 308 SW 3-row
Key Differences
The BMW X3 offers a significantly longer cargo space with seats fully folded down: +13 in (23%) compared to the Peugeot 308 SW 3-row. When all seats are upright, the BMW even has a very large advantage: +23.6 in (171%).
The Peugeot leads in two areas: with the first row upright, the 308 SW has +5.1 in (14%) more cargo length than the BMW, and the trunk opening is +3.9 in (13%) higher on the Peugeot.
The loading edge depth (loading edge to trunk floor) is 1.6 in (300%) greater on the Peugeot. Smaller differences under 10% are: the narrowest trunk width in favor of the BMW (+3.5 in / 9%) and the opening width in favor of the Peugeot (+0.4 in / 1%).
What are the implications for usability?
Cargo length: The BMW is the better choice when it comes to maximum usable length — both with seats fully folded and with full seating. This makes it more practical for long items or when regularly traveling with full occupancy plus additional luggage.
The Peugeot, on the other hand, offers slightly more usable length with the "first row upright" configuration, which can be useful in situations where only certain rows are used or partially folded.
Access and interior height: The higher trunk opening and greater loading edge depth on the Peugeot make loading tall or bulky items easier and provide more interior height near the opening. This makes the Peugeot more practical for transporting voluminous or awkward cargo.
The significantly higher loading edge of the BMW (+5.5 in) means heavy cargo must be lifted higher; this can make loading more strenuous but often increases ground clearance and protects against damage when driving over uneven terrain.
Width and pass-through: The slightly greater narrowest width in the BMW (just under 10%) gives it an advantage with very wide items but is not a major difference in everyday use. The nearly identical opening width has little practical impact.
Conclusion: For maximum usable cargo area and transporting long items, the BMW X3 has the advantage. For easier access to tall or bulky luggage and more flexible interior height, the Peugeot 308 SW 3-row is preferable.
Which choice makes more sense depends on the typical cargo (long vs. tall/voluminous) and whether you more often travel fully occupied or with folded seats.