Trunk comparison: Opel Grandland vs VW Caddy Wagon

Key Differences and Their Impact on Usability
The Opel Grandland offers a trunk that is 20.9 in (46%) longer with the seats folded down compared to the VW Caddy Wagon, while the Caddy has a cargo area that is 7.1 in (20%) longer than the Grandland with the first row of seats upright.
The trunk opening of the Caddy is 13 in (41%) higher, which makes storing tall items easier.
Additionally, the Grandland has a depth (distance from loading edge to trunk floor) that is 5.5 in (700%) greater, meaning a significantly deeper cargo floor, and the loading edge of the Grandland is 8.3 in (37%) higher above the ground.
Furthermore, the Caddy is 4.7 in (12%) wider at the narrowest point of the trunk; the width of the trunk opening differs by only 5% in favor of the Caddy (not highlighted).
In practice, this means: The Grandland is better suited for very long loads with the rear seats folded down (more usable length) and has a deeper cargo area, which allows placing items in a lower recess. However, the higher loading edge makes lifting heavy loads more strenuous and limits level loading.
The Caddy is more practical when the rear seats are in use or when tall/voluminous items need to be loaded regularly: the higher opening, greater minimum width in the cargo area, and lower loading edge make it easier to load and position bulky parts as well as to load heavy items.
In short: Grandland = more cargo length and deeper cargo floor with folded seats; Caddy = better everyday usability for tall, bulky, or frequently changing loads with seats in use and easier, more ergonomic loading and unloading.