Trunk comparison: Opel Astra Wagon vs VW ID.3

Overview
The Opel Astra Sports Tourer offers significantly more cargo length and a larger opening, while the VW ID.3 scores with slightly more trunk depth and a higher loading edge.
The largest, practically relevant differences (>10%) concern cargo length, trunk opening, trunk opening height, trunk depth, and loading edge height.
Cargo Length
Opel Astra Sports Tourer is longer: With the seats folded down, the Astra is 9.8 in (+16%) longer, and with the first row upright even 9.1 in (+29%) longer than the ID.3. Practical consequence: The Astra is clearly better suited for long items (skis, furniture boards, ladders) and for users who regularly need to transport long or bulky cargo.
Trunk Opening and Interior Height
Opel has a higher opening height (+3.9 in / +13%) and a wider opening (+4.3 in / +11%). This means that bulky or tall items fit more easily through the opening and loading and unloading is overall more flexible. The narrowest width in the trunk differs by only 1% and is therefore negligible.
Trunk Depth and Loading Edge
VW ID.3 offers slightly more depth inside (+0.8 in / +14%), meaning a bit more usable vertical/storage space between the loading edge and trunk floor. This can help when stacking luggage but does not compensate for the shorter cargo length of the ID.3.
The loading edge of the ID.3 is significantly higher (+6.3 in / +26%), which makes lifting heavy items more difficult and loading and unloading more strenuous. Combined with the shorter cargo length, the higher loading edge noticeably limits practical usability for frequent transport of heavier or bulky loads.
Practical Conclusion
For users who often transport long, bulky, or tall items (families with sports equipment, craftsmen, DIY users), the Opel Astra Sports Tourer is the more practical choice: more cargo length, larger opening, and lower loading edge make usage significantly easier.
The VW ID.3 offers a slightly deeper loading floor with a marginally different storage shape but is less suitable for long items and is limited by the higher loading edge when loading. It is more suitable for users focused on compact electric mobility and occasional luggage transport.