Trunk comparison: Ford Focus Wagon vs Opel Astra Wagon

Key Differences
The most noticeable difference is that the Ford Focus Wagon offers a 7.1 in (11%) longer cargo area with the rear seats folded down than the Opel Astra Wagon.
All other measured differences are significantly smaller: the Astra provides 1.2 in (3%) more cargo length with the first row of seats upright, the trunk opening of the Astra is 2.8 in (10%) higher, depth (loading edge → trunk floor) is the same, the loading edge of the Focus is 1.6 in (7%) higher above the ground, the narrowest trunk width in the Focus is 1.6 in (4%) larger, and the opening width in the Focus is 1.2 in (3%) larger.
Impact on Usability
The 11% longer cargo area of the Focus with folded seats makes it noticeably more practical for long or bulky loads (e.g., furniture parts, slats, bicycles without front wheel, long boxes). When frequently transporting large or long items, the Focus thus offers a real practical advantage.
The Astra has advantages in vertical loading: the 2.8 in higher trunk opening makes loading and unloading tall items easier and provides more headroom when loading.
The 1.2 in longer usable space with the first row of seats upright is practical when frequently carrying passengers and some luggage in the rear, but has only a minor effect.
Small width and height differences (a few centimeters in favor of the Focus for narrowest width and opening width, higher loading edge on the Focus) are marginal in practice: the slightly higher loading edge height of the Focus makes lifting heavy items somewhat more strenuous, while the slightly larger width makes fitting wider parts a bit easier.
In summary: For regular transport of long, flat, or wide goods, the Ford Focus Wagon is the better choice. For comfortable loading of tall items and when a combination of passengers and cargo is needed, the Opel Astra Wagon offers small advantages.