Trunk comparison: Toyota Corolla Wagon vs VW ID.3

Key Differences
The Toyota Corolla Touring Sports offers significantly more cargo length: with the seats folded down, the trunk is 13 in (≈22%) longer, and with the first row of seats upright, 9.1 in (≈29%) longer than the VW ID.3. The height of the trunk opening is the same in both models.
The VW ID.3 mainly differs in height: the depth of the trunk (loading edge → trunk floor) is 3.1 in (100%) greater in the ID.3, and the loading edge is 5.1 in (≈20%) higher above the road than in the Toyota.
The width at the narrowest point is 2.4 in (≈6%) greater in the ID.3, and the width of the trunk opening is 2.8 in (≈7%) greater in the Toyota — these differences are under 10%.
Impact on Usability
More cargo length in the Toyota means practically: longer items (e.g., plywood sheets, skis, longer furniture parts, folded bicycles) can be transported more easily and often without complicated seat adjustments. With full seat usage, the Corolla also offers noticeably more usable depth.
The higher trunk floor and higher loading edge of the ID.3 have different effects: heavy or bulky items need to be lifted higher, making loading and unloading more strenuous, and the usable interior height is reduced for very low items.
Positively, the greater floor depth in the ID.3 can mean that flat-lying items sit deeper and protrude less when heavily loaded. Smaller width differences (under 10%) have only minor practical effects on everyday usability.
In short: For longer loads and overall longer usability in cargo volume, the Toyota is the more practical choice; for a higher positioned loading surface with a deeper trunk floor (with pros and cons in handling), the ID.3 is the option.