Trunk comparison: Opel Corsa vs VW Polo

Key Differences
The overall trunk lengths are the same with the first row of seats upright; however, when the rear seats are folded down, the VW Polo offers 2.4 in (≈5%) more length than the Opel Corsa. The trunk opening is 1.6 in (≈6%) higher on the Opel Corsa, while the loading edge height is the same on both models.
At the narrowest point, the Polo's trunk is 2.4 in (≈6%) wider, and the width of the trunk opening is also +2.4 in (≈7%) on the Polo. Notably, the depth (loading edge to trunk floor) is 3.9 in greater in the Opel Corsa — about +125% compared to the Polo.
Implications for Usability
The large depth of the Opel Corsa is the most significant practical difference: it means considerably more vertical or usable interior space below the loading edge, allowing bulky or stackable items to fit better and more volume to be effectively used.
This is especially relevant when transporting taller cargo or stacking suitcases and boxes. However, a significantly deeper loading floor can make lifting heavy items over the loading edge somewhat more strenuous.
The VW Polo scores points for width and folded-down loading length: the slightly greater width at the narrowest point and the wider opening make it easier to maneuver wider items inside and make loading bulky, flat parts (e.g., furniture panels, wide boxes) more practical.
The 2.4 in longer loading length with folded seats also offers a small advantage for very long, flat cargo.
In summary: for more vertical volume and better stackability, the Opel Corsa is clearly advantageous; for loading wider or very flat items as well as for somewhat more usable loading length with folded seats, the VW Polo is preferable.
The loading edge height is the same on both models, so loading and unloading remain comparable in this respect.