Trunk comparison: BMW 3 Series Touring vs BMW X4

Key Differences

The most noticeable difference is the significantly greater depth of the trunk in the BMW X4: the distance from the loading edge to the trunk floor is +2.8 in (±700%) larger in the X4 than in the 3 Series Touring.

Additionally, the loading edge of the X4 sits much higher above the road: +7.5 in (+32%) compared to the 3 Series Touring. These two differences exceed the 10% mark and are therefore the most important for everyday usability.

Other, Smaller Deviations

The 3 Series Touring offers about +1.2 in longer loading length with the seats folded down, and the height of the trunk opening in the Touring is slightly higher (+0.8 in).

The X4 has a slightly greater width at the narrowest point (+2 in), a somewhat wider trunk opening (+1.2 in), and with the rear seat upright, a minimally longer loading surface (+0.8 in). These differences are in the single-digit percentage range and are hardly noticeable for many users.

Impact on Usability

The significantly greater trunk depth of the X4 increases the usable interior volume and allows for loading longer or taller items behind the loading edge without them protruding far outward.

At the same time, the much higher loading edge makes lifting heavy loads into the X4 less comfortable — loading groceries, strollers, or bulky boxes requires more effort or aids.

The 3 Series Touring, with its lower loading edge, is more ergonomic for regular loading and unloading of heavy items and has advantages due to the slightly higher opening when storing tall items through the tailgate.

In short: Those who frequently transport heavy or often reloaded items and value easy loading and unloading benefit more from the 3 Series Touring.

Those who need more (internal) depth and a slightly higher cargo space for bulky but not necessarily heavy items will find advantages in the X4 — with the trade-off of the significantly higher loading edge.