Trunk comparison: Volvo XC40 vs VW Polo

Key Differences
The Volvo XC40 offers a cargo space that is 11.8 in (22%) longer with the rear seats folded down than the VW Polo and remains clearly ahead even with the first row of seats upright: +9.8 in (38%).
The trunk opening of the XC40 is also wider: +5.5 in (15%). In contrast, the VW Polo has a significantly greater depth between the loading edge and the trunk floor: +3.1 in (700%), meaning a much steeper drop from the loading lip to the bottom of the cargo area.
Smaller differences (not highlighted) include: the height of the XC40's trunk opening is +1.6 in (6%) larger and the loading edge of the XC40 is +2 in (7%) higher above the road. At its narrowest point, the Polo is only +0.4 in (1%) wider.
What Impact Do These Differences Have on Usability?
For longer or bulky items (furniture, long packages, skis, bicycle parts), the Volvo XC40 is clearly advantageous: the longer cargo floor both with folded and upright seats as well as the wider opening make loading easier and allow for larger, bulky loads.
This makes the XC40 more versatile for moving, trade supplies, or sports equipment.
The greater depth drop in the Polo (loading edge → trunk floor) means that the Polo has a significantly "deeper" cargo floor below the loading edge. This can be advantageous when storing luggage lower down and out of sight or when stacking small suitcases.
At the same time, this step creates an additional dip that can make loading and unloading heavy items more difficult because they must be lowered after overcoming the loading edge.
The slightly higher loading edge of the XC40 (about +2 in) makes lifting heavy loads in slightly more strenuous, but compared to the advantage in length and width, this is usually secondary. The slightly larger opening height of the XC40 (+1.6 in) minimally facilitates loading very bulky items.
Conclusion: For users who frequently transport long or wide loads, the Volvo XC40 offers the more practical dimensions.
Those who mainly transport smaller suitcases and shopping bags and benefit from a deeper cargo recess can manage with the VW Polo — but for heavy or very cumbersome cargo, the XC40 is overall more flexible.