Trunk comparison: BMW X4 vs VW Taigo

Key Differences
When comparing the trunk dimensions, three clearly significant differences stand out: With the front seats upright, the trunk of the BMW X4 is 7.9 in (24%) longer than that of the VW Taigo, giving the X4 a clear length advantage for longer luggage or bulky items with a flat lying surface. The trunk opening of the VW Taigo is 3.9 in (14%) higher, and the depth of the trunk (distance from loading edge to trunk floor) is 4.7 in (150%) greater in the Taigo — both indicating that the Taigo offers more height/vertical space in the cargo area.
Other smaller differences: with the rear seats folded down, the X4 is 6.3 in (10%) longer (borderline case), the loading edge of the BMW is 1.6 in (5%) higher above the road, the narrowest width of the trunk is 0.4 in (1%) larger in the X4, and the width of the trunk opening is 1.6 in (4%) larger in the X4.
Implications for Usability
The BMW X4 is better suited when length matters: the significantly greater interior length with the rear bench upright makes it easier to transport longer items (skis, slats, long boxes) without folding seats down.
The slightly larger opening width and the minimally greater narrowest width also help when loading wide, flat cargo.
The VW Taigo scores points for vertical volume and loading tall or bulky items: the higher trunk opening and the significantly greater depth between loading edge and floor create more space to stand items upright or stack them higher.
Practically, this means bulky, tall luggage and stackable cargo are easier to accommodate in the Taigo. The lower loading edge (BMW +1.6 in) makes lifting heavy items into the Taigo slightly easier.
In summary: for long, flat loads, the BMW X4 is more advantageous in everyday use; for high-volume, stackable, or upright cargo, the VW Taigo is usually more practical. Smaller differences in loading edge height and opening width only marginally affect daily handling.