Trunk comparison: Kia Ceed vs Skoda Octavia Wagon

Key Differences
The Škoda Octavia Wagon offers significantly more cargo length: with the seats folded down, the trunk is 12.6 in (21%) longer, and with the first row upright, it is 11.8 in (38%) longer than the Kia Ceed. Both differences exceed 10% and are therefore significant.
Other Differences (less than 10%)
The height of the Octavia's trunk opening is 1.2 in (4%) larger. The depth of the trunk (loading edge to floor) is 0.4 in (10%) higher in the Kia. The Kia's loading edge is 0.8 in (3%) higher above the ground.
At the narrowest point, the Kia's trunk is 1.2 in (3%) wider, while the width of the trunk opening is 1.2 in (3%) larger in the Octavia. These deviations are minor and only marginally affect everyday usability.
Impact on Usability
Due to the significantly greater cargo length, the Octavia Wagon has a clear advantage when regularly transporting long items (e.g., slats, furniture parts, skis, long boxes). When loading with folded seats, the Octavia also offers more flexibility for bulky or voluminous cargo.
The Kia Ceed scores only with small advantages: slightly greater depth at the loading edge and a minimally wider narrow spot. This can be helpful when stacking or fitting wider, but not longer, items.
The slightly higher loading edge of the Kia makes loading and unloading heavy items slightly less comfortable compared to the Octavia.
Conclusion
If long or bulky items are frequently transported, the Škoda Octavia Wagon is the more practical choice due to its significantly greater cargo lengths. For mostly daily shopping and occasional, rather compact loads, the differences are minor and the Kia Ceed remains a viable alternative.