Trunk comparison: BMW 5 Series Touring vs Skoda Superb Wagon

Key Differences
The Škoda Superb Wagon offers a significantly longer loading length with the rear seats folded down: +9.1 in (12%) compared to the BMW 5 Series Touring. The trunk opening of the Škoda is +4.7 in (17%) higher, and the trunk depth (distance from loading edge → trunk floor) is +3.1 in (700%) greater in the Škoda.
Conversely, the loading edge of the BMW sits +2.8 in (12%) higher above the ground. The width at the narrowest point is 2.4 in (+6%) larger in the BMW, and the trunk openings of both models are the same size; these differences are below the 10% threshold and are therefore less relevant.
Implications for Usability
The longer loading length of the Škoda with folded seats makes it significantly more practical for long items (slats, boards, skis, furniture parts): items that do not fit or only fit diagonally in the BMW can usually be transported easily in the Škoda.
The higher trunk opening of the Škoda facilitates loading tall items (e.g., boxes, bulky suitcases, equipment) because more interior height is available at the opening.
The greater depth of the Škoda means more usable volume and that cargo sits deeper in the trunk — this stabilizes luggage and better hides it from view.
At the same time, bending/reaching in is somewhat more necessary than with a flatter floor, but lifting loaded items over the loading edge is easier because the loading edge sits lower.
The higher loading edge of the BMW (+2.8 in) makes lifting heavy items more strenuous and increases the threshold for frequent loading/unloading (shopping or beverage crates).
Advantages of a higher loading edge are rare; it can slightly protect against lateral intrusion of water or dirt but is primarily an ergonomic disadvantage when loading in practice.
Width differences under 10% (e.g., the slightly narrower pinch point in the Škoda) have no noticeable impact in most everyday situations; the identical opening cross-section of both models means very wide items fit equally well at the opening.
In summary: For long, tall, or bulky cargo, the Škoda Superb Wagon is the more practical choice.
The BMW 5 Series Touring offers advantages only in the minimally larger interior width at the narrowest point and a slightly longer trunk length with the first row of seats upright, which are less significant in everyday use.