Trunk comparison: BMW i4 vs BMW X1

Key Differences

The comparison reveals different strengths: The BMW i4 has a significantly greater trunk depth (loading edge to trunk floor) – +2.8 in, which is about 233% compared to the X1.

This means the i4 offers a deeper cargo area where items can be more "recessed." This reduces shifting and creates space for bulky but not particularly wide cargo; at the same time, loading and unloading heavier items can be somewhat less convenient because they need to be lifted from a lower position.

The BMW X1 scores points in width: The narrowest point in the trunk is +5.1 in (≈15%) wider, and the width of the trunk opening is +5.1 in (≈14%) larger than in the i4. This makes it easier to maneuver wide or bulky items (e.g., wide boxes, strollers, furniture parts, or travel bags) in and out.

A larger opening also simplifies loading bulky cargo and reduces the risk of hitting the sides.

Other, smaller differences: With the rear seats folded down, the i4 is longer (+4.7 in / 7%), and with the rear bench upright, it remains slightly longer (+3.1 in / 9%).

The trunk opening of the X1 is +2 in (7%) higher, which makes it easier to fit tall items through. The loading edge of the X1 is only +0.4 in (1%) higher above the road, a difference that is practically negligible.

Practical Implications

For users who often need to transport wide or bulky items (e.g., strollers, wide moving boxes, sports equipment), the BMW X1 is more advantageous in practice: the greater interior width and wider opening facilitate handling and increase flexibility when loading.

Those who frequently transport lower-lying, elongated, or bulky but not very wide cargo (e.g., suitcases, groceries, delicate items that should be better secured at the bottom) benefit from the deeper trunk floor of the BMW i4. The slightly longer loading length with folded seats additionally supports transporting longer items.

In short: X1 = better for width and easier maneuvering of bulky parts; i4 = better for depth, securing and storing cargo in the trunk floor, and a somewhat longer loading area with folded seats.