Trunk comparison: Tesla Model Y vs VW Tiguan Allspace

Key Differences
The most noticeable difference: The Tesla Model Y offers significantly more cargo space with upright seats — +25.2 in or +136% compared to the VW Tiguan Allspace when all seats are upright.
Folded down, the difference is small: the Model Y has only +1.6 in (2%) more trunk space. With the first row upright, the Tiguan is slightly ahead (+0.4 in / 1%).
The width of the trunk opening is +5.1 in (13%) larger on the Tiguan, while the narrowest point inside the Tiguan's trunk is only slightly wider (+2 in / 5%).
The Tiguan's trunk opening is +1.2 in (4%) higher; the depth (loading edge to floor) of both vehicles is the same. The Tiguan's loading edge sits +2.8 in (10%) higher above the road than the Model Y.
Implications for Usability
Due to the significantly larger volume with upright seats, the Model Y is more practical for daily transport of luggage, groceries, strollers, or transport boxes without folding seats — it offers noticeably more usable depth/height in the cargo area during normal use.
For users who often want to transport large amounts with full seating (e.g., vacations with lots of luggage, pet crates), the Model Y is noticeably advantageous in everyday use.
The Tiguan Allspace, on the other hand, scores with simple, wide cargo pieces: The wider trunk opening (+5.1 in) makes loading bulky, flat, or wide items (furniture parts, boxes, sports equipment) easier.
However, the loading edge on the Tiguan is higher (+2.8 in / 10%), which makes lifting heavy loads when loading more strenuous.
The slightly higher opening (±1.2 in) and larger opening width improve handling of large, wide objects, but the lower available interior volume with upright seats limits the amount of luggage that can be transported without folding down seats.
In short: Model Y = significantly more usable storage space in everyday use with full seating; Tiguan Allspace = better access for wide/bulky items, but with a higher loading edge and overall less volume with seats upright.