Trunk comparison: Audi Q5 vs VW Polo

Key Differences
The Audi Q5 offers significantly more usable cargo space: With the seats folded down, the trunk of the Q5 is 11 in (20%) longer than that of the VW Polo, and with the first row of seats upright, it is even 11.4 in (44%) longer.
The trunk opening of the Q5 is higher and wider: the opening height is +3.9 in (14%) compared to the Polo, and the opening width is +8.3 in (23%) larger.
The depth from the loading edge to the trunk floor is the same; the loading edge of the Q5 is only +1.6 in (6%) higher above the road, and the narrowest width is practically identical at +0.4 in (1%).
Impact on Usability
More length with folded seats (20%) means easier transport of long items such as slats, bed bases, or long furniture parts and overall greater payload with fully folded rear seats.
The significantly greater length with the first row upright (44%) improves everyday usability with passengers: more space for larger suitcases, shopping trolleys, or luggage behind the rear seats without folding the seats down.
The higher opening (14%) and especially the significantly larger opening width (23%) make loading bulky or tall items (boxes, strollers, larger cartons) easier and reduce maneuvering when loading. This makes the Q5 more practical for families, moving, or frequent transport of bulky goods.
Constant depth means that the cargo floor offers no advantage in terms of distance to the loading edge.
The slightly raised loading edge of the Q5 (+1.6 in) requires a bit more effort when lifting heavy loads but is a minor disadvantage in practice compared to the significantly greater loading benefits. The minimally larger narrowest width (+0.4 in) is negligible.
Conclusion: Those who regularly transport long, wide, or tall items or need more storage space behind the seats with passengers will gain significantly in utility from the larger dimensions of the Audi Q5. For typical city and occasional use, the compact Polo is sufficient; for frequent and bulky loading, the Q5 is clearly advantageous.