Trunk comparison: BMW 3 Series Touring vs Jeep Avenger Electric

Key Differences
The BMW 3 Series Touring offers significantly more cargo length: with the seats folded down, its trunk is 16.1 in (31%) longer than the Jeep Avenger Electric, and with the first row upright, it is even 13 in (49%) longer.
The Jeep Avenger Electric scores in vertical space and interior profile: the depth of the trunk (loading edge to trunk floor) is 3.9 in (1000%) greater in the Avenger, and the loading edge is 4.7 in (20%) higher above the road than in the BMW.
Smaller differences, below the 10% threshold, include the trunk opening height of the Avenger (+2.8 in / 10%) and the widths: the narrowest point is only +2 in (6%) wider in the BMW, and the opening width is only +0.4 in (1%) larger in the BMW.
Impact on Usability
Due to the significantly greater cargo length, the BMW 3 Series Touring is better suited for long items (skis, slats, furniture) and flexible transport with folded rear seats — more usable area means easier stackable cargo and better usable storage space for longer transports.
The Jeep Avenger Electric offers more vertical space and a deeper cargo well thanks to the greater depth of the loading floor and the overall higher loading edge: this facilitates storing tall or bulky items directly behind the loading edge and more easily prevents smaller items from shifting during trunk changes.
At the same time, the higher loading edge requires lifting heavy loads higher into the vehicle, making loading bulky or heavy items less comfortable compared to the lower entry level of the BMW.
Small width differences are hardly relevant in practice; the main decisions therefore concern length versus floor depth and loading height: BMW = better for long, flat cargo and easy loading and unloading of low-level loads; Avenger = better for bulky, deeper-lying cargo, less ideal for heavy items due to the higher loading edge.