Trunk comparison: Citroen C3 vs Volvo XC60

Key Differences
The Volvo XC60 offers significantly more cargo space in length: with the seats folded down, its trunk is 16.5 in (31%) longer and with the first row upright, 11.4 in (43%) longer than the Citroën C3. Additionally, the Volvo's trunk is 5.9 in (16%) wider at its narrowest point, and the opening is 9.4 in (27%) wider than the C3's.
On the other hand, the Citroën C3 has a significantly deeper trunk well: the depth (loading edge to trunk floor) is 9.1 in (2200%) greater than the Volvo's.
Impact on Usability
The longer and wider cargo space of the Volvo XC60 makes it more advantageous for long or bulky items (e.g., longer furniture, skis, building materials) and facilitates loading and positioning large boxes or suitcases.
The larger opening width improves accessibility when loading wide items and reduces the risk of bumping the sides.
The Citroën C3 scores with its significantly deeper trunk well: items sit lower, which lowers the center of gravity of the load and creates more usable volume below the loading edge for stackable items.
This can be practical when you want to fit a lot of volume into a compact footprint or prefer less visible cargo. At the same time, the greater "depth" can make lifting heavy items into the vehicle somewhat less convenient, as they need to be lowered further.
Additional Notes
Smaller differences under 10%—such as the C3's 2 in higher trunk opening or the 2.4 in higher loading edge compared to the XC60—have only minor practical effects in everyday use but can be relevant when frequently lifting heavy loads or passing under high obstacles.