Trunk comparison: BMW 5 Series Touring vs Durchschnitt Wagon

Key Differences
There are significant differences in the height of the trunk opening and the depth of the loading edge area: The trunk opening of the average wagon is 3.5 in (≈13%) higher than that of the BMW 5 Series Touring.
The depth of the trunk (loading edge to trunk floor) is specified as 1.6 in greater in the average wagon — which is indicated here as 300% larger and thus means a significantly deeper cargo area in the loading edge region.
All other deviations are below or around 10% (e.g., longer trunk with folded seats in the BMW +6.7 in / 10%, longer loading surface with upright front seats in the BMW +3.5 in / 9%, loading edge height BMW +1.2 in / 5%, width advantages BMW +2–1.2 in / 2–3%).
Impact on Usability
Higher trunk opening (average wagon): An opening dimension about 13% higher makes it easier to load tall items (e.g., tall boxes, suitcases, plants) and reduces the risk of hitting the edge when placing boxes.
For users who often work with standing cargo or frequently transport bulky, tall parts, this is practically decisive.
Deeper loading zone at the loading edge area (average wagon): The significantly greater depth at the transition from loading edge to floor creates more usable interior height directly behind the loading edge.
This facilitates storing bulky items without them hitting the loading edge and improves usability for stacked or upright cargo.
Length and width advantage in the BMW: The BMW offers more cargo length with folded seats (+6.7 in / 10%) and slightly more width at the narrowest point as well as at the opening (+2–1.2 in).
This makes it better for long, flat items (boards, furniture parts, skis) and for wide, flat cargo. However, the slightly higher loading edge of the BMW (+1.2 in) means more lifting effort when loading heavy items.
Practical conclusion: Those who frequently load tall or very bulky items (standing cargo, large boxes) benefit from the average wagon due to the higher opening and deeper loading zone.
Those who transport long, flat, or wide items and value longer cargo space with folded seats are better served by the BMW 5 Series Touring — although loading heavy items is somewhat more strenuous due to the higher loading edge.