Trunk comparison: Fiat Panda vs Tesla Model Y

Key Differences
The Tesla Model Y offers significantly more cargo length: with the seats folded down, the trunk is +32.7 in (75%) longer, and with the first row of seats upright, the advantage is even +22.4 in (106%).
The Fiat Panda, on the other hand, has a higher opening and a significantly deeper cargo area: the height of the trunk opening is +7.5 in (28%) greater on the Panda, and the depth (loading edge to trunk floor) is +7.1 in (1700%) greater on the Panda.
All other differences (loading edge height +0.4 in, narrowest width +2.4 in, opening width +0.4 in) are under 10% and practically marginal.
Impact on Usability
For long items and bulky, flat cargo (e.g., slats, multiple boxes in a long row, long furniture parts), the Model Y is clearly advantageous: the significantly greater cargo length with both folded and upright seats allows for longer loads without complicated stacking or leaning.
The Panda is more practical for tall or bulky but not particularly long items: the higher opening makes loading large, tall packages or equipment easier, and the significantly deeper cargo area creates more volume below the loading edge.
This can be useful when you want to "sink" bulky items into the trunk or when a lot of loadable volume in the form of a deep trunk floor is needed. At the same time, the deeper floor makes lifting heavy items over the loading edge somewhat more cumbersome and complicates access to items lying deep down.
In practical summary: Those who frequently transport long items or value a flat, continuous cargo floor are better served by the Tesla Model Y. Those who often have tall, bulky, or irregularly shaped cargo and benefit from a higher opening and a deep cargo area should consider the Fiat Panda.