Trunk comparison: Hyundai IONIQ vs Peugeot 308 SW 3-row

Key Statements (most important differences highlighted)
The Hyundai IONIQ offers significantly more volume in practical everyday use with fully upright seats: +22 in (160%) longer trunk than the Peugeot 308 SW 3-row.
However, if the first row of seats remains upright, the Peugeot has an advantage of +6.7 in (19%). With seats fully folded down, the IONIQ is again ahead with +7.1 in (12%) longer cargo space.
The loading opening of the Peugeot is significantly higher and wider: the opening height is +9.1 in (35%) more than the IONIQ, and the width of the trunk opening is +7.5 in (20%) larger.
In contrast, the trunk depth (loading edge → floor) is +3.1 in (200%) greater in the IONIQ, and the loading edge of the IONIQ is +7.1 in (32%) higher above the road. The narrowest interior width differs very little (+0.4 in / 1% in favor of Peugeot).
Implications for usability
For passengers with full seating and normal luggage, the Hyundai IONIQ is clearly advantageous: the significantly longer trunk with upright seats (+22 in / 160%) means more usable volume without folding seats — practical for suitcases, shopping, and strollers.
Even with seats fully folded down, the IONIQ offers more length (+7.1 in / 12%), which facilitates transporting long items (e.g., furniture parts, skis).
The Peugeot scores when it comes to loading bulky, tall, or wide single items: the higher opening (+9.1 in / 35%) and wider trunk opening (+7.5 in / 20%) make loading large boxes, cabinets, or wide objects significantly easier.
Additionally, the Peugeot has more usable length (+6.7 in / 19%) in a certain seat configuration (first row upright), which is advantageous in everyday use with multiple occupants.
Concrete practical consequences: heavy or low loads are easier to load in the Peugeot because the loading edge is significantly lower; long, flat, or deep cargo benefits from the IONIQ’s greater interior/floor depth and longer loading area.
For users who frequently transport wide or tall single items, the Peugeot is more practical. Those who regularly travel with full occupancy and lots of luggage or want to transport long items benefit from the IONIQ’s space offering.
The very small difference in narrowest interior width (+0.4 in) is negligible.