Trunk comparison: Hyundai Elantra GT Wagon vs Mazda Mazda CX-5

Highlighted Differences (>10%)
Height of the trunk opening: The Mazda CX‑5 has an opening that is 4.7 in (18%) higher than the Hyundai i30 Wagon. This means: bulky or tall items fit more easily through the opening, and loading standing boxes or tall furniture parts is more comfortable with the CX‑5.
Depth of the trunk (loading edge → floor): This distance is 2 in (400%) greater in the Mazda. Practically, this means: the CX‑5 has a significantly deeper cargo area below the loading edge, resulting in more usable interior height and better stackability.
At the same time, there is more lift or lowering distance when loading, which can make heavy lifting more difficult.
Loading edge height above the road: The loading edge of the Mazda is 5.5 in (23%) higher than that of the i30 Wagon. Consequence: lifting heavy items into the trunk requires more effort and is less ergonomic; for frequent loading of heavy loads, this is a disadvantage.
Other, smaller differences (<10%)
The Hyundai i30 Wagon is 3.1 in (5%) longer with the seats folded down and 3.5 in (9%) longer with the first row of seats upright — marginally more loading length for long items.
The narrowest width of the trunk is 1.2 in (3%) larger in the Mazda, and the width of the trunk opening is 3.1 in (8%) wider in the Mazda — slight advantages for wide cargo, but below the 10% threshold.
Consequences for usability
For users who frequently transport tall or bulky items (e.g., plants, boxes, bulky sports equipment), the Mazda CX‑5 is advantageous: larger opening and deeper interior increase practical usability.
However, those who regularly lift heavy loads or place great value on easy, back-friendly loading benefit from the lower loading edge height of the Hyundai i30 Wagon. For long, flat items, the i30 Wagon offers slightly more length; for wide items, the CX‑5 provides a bit more width at narrow points and at the opening.
In short: Mazda = better for bulky, tall cargo and stackability; i30 Wagon = more comfortable handling when lifting and slightly better loading length for long items.