Trunk comparison: Hyundai Elantra GT Wagon vs Mercedes Benz GLC

Key Statement
The Hyundai i30 wagon offers a 4.7 in (13%) longer loading length with the rear seats upright, while the Mercedes-Benz GLC has advantages in the loading opening and loading convenience: the loading opening is 3.5 in (13%) higher, the loading edge is 3.5 in (15%) higher above the ground, and the loading opening is 4.7 in (12%) wider.
Small differences (<10%) such as the trunk width at the narrowest point (+3.1 in in favor of the GLC) and the full length with folded seats (+1.2 in in favor of the i30, 2%) are less relevant in practice. The depth of the trunk (loading edge → floor) is the same.
Impact on Usability
Hyundai i30 Wagon — Advantage for longer items without folding seats: The 13% greater loading length with the rear seats upright makes the i30 more practical when regularly transporting long items (e.g., slats, skis, long boxes) without sacrificing seating.
With fully folded seats, the models are nearly equal (only 2% difference).
Mercedes-Benz GLC — Advantage when loading and for wide/tall goods: The greater height of the loading opening (+13%) and the larger opening width (+12%) make it easier to slide in bulky or tall items.
At the same time, the loading edge is significantly higher (+15%), which makes lifting heavy loads onto the cargo floor more strenuous and a disadvantage when loading without lifting assistance.
Overall, the GLC is better when opening dimensions (width/height) and flexibility for fitting large items matter, less so when frequent lifting of heavy loads from the ground is required.
Practical Conclusion
For regular transport of long items with full seating, the Hyundai i30 wagon is more practical. For bulky, wide, or tall cargo that fits through a large opening, the Mercedes-Benz GLC scores — but at the cost of greater effort when lifting to the loading edge.
Trunk depth and folded cargo floor are comparable, so the comparative loading length with occupied seats and the opening dimensions determine usability in everyday life.