Trunk comparison: Kia Stonic vs Opel Astra Wagon
Comparison (Brief)
The Opel Astra Sports Tourer offers a significantly larger cargo area with the seats folded down: it is 16.1 in (≈30%) longer than the Kia Stonic.
With the first row of seats upright, the Astra even has a length advantage of 13 in (≈48%). The trunk opening of the Astra is only 2.4 in (8%) higher, but the width of the opening is 3.1 in (8%) larger than that of the Stonic.
Regarding interior dimensions, the Kia Stonic is 1.6 in (≈29%) deeper at the lowest point of the trunk (loading edge to trunk floor) than the Astra, while the loading edge of the Stonic is 6.3 in (≈26%) higher above the ground. The narrowest interior width differs only slightly (+1.2 in / 3% in favor of the Stonic).
Impact on Usability
Volume and length: Due to the significantly greater usable length (especially with seats folded down), the Astra Sports Tourer clearly has the advantage when transporting long items — e.g., slats, long furniture parts, skis, or several large suitcases.
For moves, tradesman needs, or frequent transport of bulky items, the Astra is more practical.
Loading comfort and lifting effort: The Kia Stonic has a somewhat deeper loading floor, which means more usable interior height near the loading edge, but the loading edge itself sits significantly higher above the ground.
This increases the lifting effort when loading and unloading heavy items. Those who often lift heavy loads will therefore benefit more from the lower loading edge height of the Astra.
Width and opening: The differences in width (both at the narrowest point and at the opening) and opening height are minor to moderate and have little impact on everyday usability. The slightly wider opening on the Astra makes it easier to load wide parts but is not a major game changer.
Conclusion: For maximum cargo capacity and transporting long items, the Opel Astra Sports Tourer is the better choice.
The Kia Stonic offers a slightly deeper loading floor but feels less comfortable handling heavy loads due to the significantly higher loading edge — it is better suited for city use and lighter luggage.