Trunk comparison: BMW iX1 vs Toyota Corolla Wagon

Key Differences (highlighted: >10%)
The Toyota Corolla Touring Sports offers a trunk that is 9.4 in or 15% longer with the rear seats folded down compared to the BMW iX1. Even with the first row of seats upright, the Corolla's trunk is 4.7 in or 13% longer.
The trunk depth (loading edge to floor) of the Corolla is significantly larger by 2.4 in or 300%.
On the other hand, the loading edge of the BMW iX1 sits 3.1 in or 13% higher above the road than the Toyota. Smaller differences (under 10%) exist in the trunk opening height (+1.2 in / 4% for Toyota), the narrowest trunk width (+2 in / 5% for BMW), and the width of the trunk opening (+2.4 in / 6% for BMW).
Impact on Usability
The significantly greater length with folded and upright seats as well as the substantially larger depth make the Corolla Touring Sports the more practical choice when transporting longer or bulkier cargo: long items can be more easily fully loaded, and the larger floor area allows for more usable cargo volume or stacking luggage.
The 300% greater depth also means that items slide further "into" the trunk and protrude less upwards.
The higher loading edge of the BMW iX1 makes loading and unloading heavy or bulky items more difficult compared to the Corolla: every heavy box or bicycle must be lifted over a threshold that is 3.1 in higher. This is a noticeable disadvantage for frequent or manual loading.
BMW's advantages in narrowest trunk width and opening width are present but under 10% and remain marginal: they slightly ease accommodating wider items but do not offset the length and depth advantages of the Toyota.
Conclusion: For users who frequently transport longer, taller, or more luggage, the Toyota Corolla Touring Sports is more practical due to its significantly larger cargo dimensions. The BMW iX1 may have a slight advantage with wider items but is less comfortable to load due to the higher loading edge.