Trunk comparison: Opel Astra Wagon vs Skoda Karoq

Differences and Their Impact
The biggest practical advantage of the Opel Astra wagon is its significantly longer loading length in a certain seating configuration: the Astra has 12.2 in (≈41%) more loading length with the front seats upright than the Karoq.
This makes the Astra clearly better suited for long items (e.g., slats, furniture boards, skis) when the seats are used in this setup.
The Škoda Karoq, on the other hand, offers significantly more vertical space and a different loading height comfort: the height of the trunk opening is 5.5 in (≈18%) larger and the depth from the loading edge to the trunk floor is 5.1 in (≈650%) greater than in the Astra.
This means that higher or bulky, voluminous items can be better accommodated in the Karoq, and there is more "air" inside. At the same time, the loading edge of the Karoq is 3.5 in (≈15%) higher above the road, which makes lifting heavy loads more strenuous.
Other, smaller differences: the narrowest point in the trunk is 3.1 in (≈8%) wider in the Astra, and the width of the opening is only 0.4 in larger in the Astra — these deviations are minor and hardly affect everyday usability.
Conclusion for use: If you often transport long, flat items and value easy loading of heavy parts (lower loading edge, flatter interior), the Opel Astra wagon is usually more practical.
If, on the other hand, you more frequently have tall or bulky cargo and need the option to transport bulky items standing or stacked, the Škoda Karoq offers more flexibility due to the larger opening and significantly greater interior height — with the drawback that lifting to the higher loading edge is more tiring.