Trunk comparison: Audi Q5 vs BMW 3 Series Touring

Key Differences (highlighted: >10%)
Depth between loading edge and trunk floor: The Audi Q5 has a significantly greater distance here by +2.8 in (+700%) compared to the BMW 3 Series Touring.
Loading edge height above the road: The loading edge of the Audi Q5 is +5.5 in higher, which is +23% compared to the BMW 3 Series Touring.
Width of the trunk opening: The opening of the Audi Q5 is +5.1 in wider, or +13% larger than the BMW 3 Series Touring.
Impact on usability
Due to the significantly greater depth (loading edge → floor), the Audi Q5 offers more usable space deep in the cargo area.
This makes it easier to store bulky or taller items that can be placed in a deeper recess. However, a deep recess can make lifting over the loading edge and pulling out heavy cargo more difficult.
The higher loading edge of the Audi Q5 means that items must be lifted higher when loading. For heavy or frequently loaded items, this is less favorable than the lower BMW 3 Series Touring; it increases the effort required and can make handling suitcases or groceries more difficult.
The wider trunk opening of the Audi Q5 facilitates loading and unloading wider or bulkier items (strollers, wide boxes, furniture parts). Larger openings reduce the need to angle or force items.
Brief evaluation
The Audi Q5 clearly has the advantage when it comes to depth-, width-, and volume-related loading capacity (more space, wider opening).
For frequent lifting of heavy items, the BMW 3 Series Touring is more ergonomic due to the lower loading edge. The length advantages of the BMW (+5% each) are relatively minor and have only moderate effects in everyday use.