Trunk comparison: BMW X1 vs Opel Astra Wagon

Key Differences
The Opel Astra Sports Tourer offers significantly different everyday loading characteristics compared to the BMW X1. Notably: the trunk is 4.7 in (+13%) longer with the front seats upright, the height of the trunk opening is 5.1 in (+18%) larger, and the depth from the loading edge to the trunk floor is 4.3 in (+367%) greater in favor of the Opel.
In contrast, the BMW X1's loading edge is 3.9 in (+16%) higher above the ground. Smaller differences (e.g., +9% with folded seats, +1% width) are negligible; the width of the trunk opening is the same.
Impact on Usability
Due to the larger opening height and deeper loading recess, it is significantly easier and more ergonomic to handle bulky or tall items with the Opel: tall boxes, strollers, or larger suitcases can be loaded standing up or with less tilting into the cargo area.
The additional trunk depth also lowers the load, which means more usable volume below the loading edge and a lower center of gravity.
The longer loading floor with the front seats upright makes the Astra more practical for longer items in everyday use (e.g., skis, slats, or longer luggage), while the distance measured in the BMW with folded seats is only slightly smaller (9%) and therefore less significant.
The higher loading edge in the BMW makes lifting heavy items onto the loading height more difficult and increases the effort required when loading. There is no advantage in width for either model: narrow points and opening width are practically identical.
Conclusion: For regularly transporting tall or bulky items and easier loading, the Opel Astra Sports Tourer is overall more practical. The BMW X1 does not have any compensating dimensions that offset the somewhat poorer loading ergonomics.