Trunk comparison: Opel Astra Wagon vs Skoda Octavia Wagon

Summary of Differences
Most noticeable feature: The depth of the trunk (distance from loading edge → trunk floor) of the Opel Astra Sports Tourer is 1.6 in (+40%) larger than that of the Škoda Octavia Combi.
Other, smaller differences: The Škoda offers +3.1 in (4%) more loading length with the seats folded down and +2.8 in (7%) more loading length with the first row of seats upright.
The trunk opening of the Opel is +2.8 in (9%) higher; the loading edge of the Škoda is +1.2 in (5%) higher above the road. In the narrowest trunk width, the Opel is +0.8 in (2%) wider, and the Opel's opening width is +1.6 in (4%) larger.
Implications for Usability
The significantly greater depth in the Opel means more usable interior space vertically: taller or bulkier cargo can be better accommodated without folding down seat rows.
Together with the slightly lower loading edge of the Opel (Škoda is 1.2 in higher), this makes lifting heavy items into the trunk easier. Drawback: a deeper trunk floor can mean smaller items are less accessible and more bending is required when loading.
The Škoda scores mainly in loading length (with seats folded down and with the first row upright), which makes transporting longer items (e.g., slats, skis, longer boxes) somewhat more comfortable — however, the differences are moderate (4–7%).
The slightly higher trunk opening and the marginally larger width values of the Opel (opening/widths) facilitate loading wider or bulkier items but have only a minor effect.
Pragmatic recommendation: Those who frequently transport heavy or tall, bulky cargo benefit more from the Opel Astra Sports Tourer. Those who mainly occasionally need to accommodate very long items have a slight advantage with the Škoda Octavia Combi.