Trunk comparison: Audi Q7 vs Hyundai IONIQ

Key Differences
The Audi Q7 offers significantly longer cargo areas: with the seats folded down, the trunk of the Q7 is 15.7 in (≈25%) longer, and with the first row of seats upright, it is 11 in (≈31%) longer than the Hyundai IONIQ.
The trunk opening of the Q7 is also noticeably larger: the opening height is 3.5 in (≈14%) higher and the opening width 10.6 in (≈29%) wider than the IONIQ. In contrast, the Hyundai IONIQ has a significantly larger distance between the loading edge and the trunk floor: the depth is 4.7 in (≈1100%) greater than the Q7.
Impact on Usability
Because the Q7 has longer cargo areas and a significantly wider and taller opening, it is more practical for long or bulky items (e.g., furniture, long slats, skis) and facilitates side loading and unloading of large parts.
The larger opening also reduces the risk of parts getting caught on the edge and makes loading with a floor dolly or hand truck easier.
The greater depth of the IONIQ means that more vertical volume can be stored in a deeper cargo well—advantageous when stacking many suitcases or securely storing items below the loading edge.
However, a deeper cargo well can make lifting heavy loads out of the trunk more difficult because it requires reaching further "down." For flat, very long, or bulky items, the IONIQ is less suitable due to its shorter length and narrower opening.
In summary: For transporting long or bulky loads and for easier loading of large items, the Audi Q7 clearly has the advantage in everyday use. If the main requirement is securely stacking luggage in a deeper cargo well, the Hyundai IONIQ offers an advantage—albeit at the expense of length and opening dimensions.