Trunk comparison: Fiat Panda vs Tesla Model 3

Key Differences (highlighted: >10%)
Tesla Model 3 has significantly more loading length: With the seats folded down, the trunk of the Tesla is +29.9 in (68%) longer, and with the front seats upright even +20.9 in (98%) longer than the Fiat Panda.
Fiat Panda offers significantly more vertical space and interior height: The height of the Panda's trunk opening is +14.2 in (69%) greater, and the depth (distance from loading edge to trunk floor) is +2.8 in (64%) larger than in the Tesla Model 3.
Smaller differences (not >10%): The loading edge of the Panda is only +0.8 in (3%) higher above the ground, and the narrowest trunk width is +2.4 in (6%) larger in the Panda. The width of the trunk opening is the same for both vehicles.
Impact on Usability
Due to the significantly greater loading length, the Tesla Model 3 is better suited for long items and flat, extended cargo (e.g., furniture parts, long slats, skis, longer boxes).
Those who frequently transport bulky but rather flat or long items or rely on maximum cargo area with folded seats benefit from the Model 3.
The Fiat Panda is better suited for tall or bulky items that need to be loaded upright or with more interior height (e.g., large boxes, taller luggage, plants). The higher trunk opening and greater interior height/depth make loading tall objects easier and provide more usable vertical space.
Since the trunk opening width is the same and the differences in loading edge height and narrowest width are minor, width and loading height differences play only a minor role in everyday use. Therefore, the primary decision criterion is: long/flat cargo → Tesla Model 3; tall/bulky cargo → Fiat Panda.