Trunk comparison: Audi Q5 vs VW Golf Wagon (Mk5)

Significant Differences (>10%)
Trunk Depth (Loading edge → Trunk floor): The Audi Q5 is 1.2 in (+60%) deeper. This means more usable vertical space below the loading edge, providing better storage for low, bulky items.
Loading edge height above the road: The loading edge of the Audi Q5 is 3.9 in (+16%) higher than the Golf. This makes lifting heavy loads into the Q5 more strenuous; at the same time, a higher vehicle rear can affect loading with long ramps/connections.
Width of the trunk opening: The opening of the Audi Q5 is 4.7 in (+12%) wider. Wide or bulky items can be loaded and unloaded more easily in the Q5.
Length with front seats upright: The VW Golf 5 offers 3.9 in (+11%) more cargo length with the rear seats upright. This is advantageous when transporting long items without folding down the seats.
Impact on Practical Use
In practice, the following picture emerges: The Audi Q5 is better suited for wider and bulkier cargo thanks to its wider opening and greater depth below the loading edge. Such features are practical for suitcases, larger transport boxes, or bulky everyday items.
The higher loading edge of the Q5 works against this: heavy lifting is more tiring, and those who frequently have to lift heavy loads over the edge benefit more from the lower loading point of the Golf.
The VW Golf 5 scores with longer cargo length with the rear seats upright — useful for long items (e.g., skis, pipes) without folding the seats. Overall, the Golf is more practical for elongated loads, the Q5 for wide/bulky and voluminous loads.
Smaller differences (e.g., +1.6 in trunk length with folded seats in favor of the Golf, +2 in height of the trunk opening in favor of the Q5) are minor and have little impact on everyday usability.