Trunk comparison: Opel Astra Wagon vs VW Golf Wagon (Mk5)

Key Differences
The measured differences are small to moderate: The VW Golf 5 has a cargo space length that is 1.6 in (≈2%) longer with the seats folded down, while the Opel Astra Wagon is 0.8 in (≈2%) longer with the first row of seats upright.
The height of the trunk opening on the Astra is 1.6 in (≈5%) greater, while the loading edge of the Golf is 2 in (≈8%) higher above the ground. The narrowest trunk width is 3.5 in (≈9%) greater on the Astra, and the opening width of the Astra is 1.6 in (≈4%) larger.
Notably, the depth between the loading edge and the trunk floor is 1.2 in (≈150%) greater in the VW Golf 5 than in the Opel Astra Wagon.
Impact on Usability
The significantly greater depth in the Golf practically means more volume directly behind the loading edge: bulky or taller items can be pushed further back, and there is more space in depth for stacking. This increases the usable cargo capacity for luggage and longer items.
However, the loading edge of the Golf also stands 2 in higher above the ground. Combined with the deeper recess, this means more storage space but somewhat more effort when lifting heavy loads over the edge. Those who frequently load heavy, bulky items alone may find this a disadvantage.
The Astra offers about 3.5 in more width at the narrowest point and a 1.6 in larger opening width as well as a 1.6 in higher opening height.
This makes loading wider or flatter items easier—less maneuvering, better accessibility, and less risk that wide parts won’t fit through the opening. The Astra’s lower loading edge height also makes lifting heavy loads easier compared to the Golf.
Conclusion
For maximum usable depth and packing density, the VW Golf 5 scores higher (clear advantage in depth). For everyday practicality—easier handling of heavy or wide items, better accessibility due to a wider opening and lower loading edge—the Opel Astra Wagon is usually more favorable.