Trunk comparison: Ford Focus Wagon vs VW ID.4

Key Differences and Their Consequences
The Ford Focus Wagon offers overall more cargo space in length, especially when the front row is upright: the Focus has a +3.9 in (11%) longer trunk than the VW ID.4. When the second row is folded down, the Focus remains somewhat longer in front, but this difference at +5.9 in (9%) is below the 10% mark and less pronounced.
In width, the Focus is clearly advantageous at the narrowest point: it is +4.7 in (12%) wider, while the width of the opening is practically the same at +0.4 in (1%).
The VW ID.4 scores in vertical capacity and accessibility: the height of the trunk opening is +3.5 in (13%) higher on the ID.4, the depth between the loading edge and trunk floor is +3.1 in (400%) greater, and the loading edge itself is +4.3 in (17%) higher above the road than on the Focus.
Impact on Usability
For long, flat, or wide items (e.g., furniture parts, long boxes), the Focus is more practical in everyday use: the greater usable length with the rear seat upright and the greater width at the narrowest point make it easier to accommodate such cargo.
Because the loading edge is lower on the Focus, heavy or bulky loads are easier to load.
The ID.4 is better suited for tall or stackable cargo: the higher trunk opening provides more vertical clearance, the greater depth from the loading edge to the trunk floor allows more interior volume in height, making it easier to accommodate, for example, tall boxes or stacked luggage.
However, the higher loading edge makes lifting heavy loads into the cargo area more strenuous.
Conclusion: Those who often transport long or wide items and value easy loading and unloading will find the Ford Focus Wagon the more practical wagon.
Those who regularly need to store taller, stackable, or bulky items vertically benefit from the higher openings and deeper interior of the VW ID.4 — at the cost of a higher loading edge.