Trunk comparison: Audi Q3 vs VW ID.3

Key Differences
The Audi Q3 offers a longer cargo floor with the rear seats upright than the VW ID.3: +4.3 in (14%). The width of the trunk opening is significantly larger on the Q3: +6.3 in (17%), which makes loading wider items easier.
The VW ID.3, on the other hand, has a considerably greater depth between the loading edge and the trunk floor: +2.8 in (78%), providing more vertical cargo space behind the loading edge.
Implications for Practical Use
The longer cargo floor of the Q3 with the rear seats upright makes it more practical for everyday use with longer items when the seats are not folded down (e.g., ski bags, longer packages).
The significantly larger trunk opening of the Q3 facilitates loading and unloading wider or bulky items (strollers, wide boxes, furniture parts) because there is less width restriction.
The greater vertical distance between the loading edge and trunk floor in the ID.3 means more usable height immediately behind the loading edge — advantageous for stacking suitcases or transporting taller items that don’t fit sideways. However, a narrower opening can make it harder to fit very wide items inside.
Other minor differences: With seats folded down, the Q3 has only a moderate length advantage of +5.1 in (8%), the loading edge of the ID.3 is slightly higher (+0.8 in), and the narrowest trunk width of the ID.3 is minimally larger (+0.4 in).
These values only slightly affect everyday usability compared to the differences highlighted above.