Trunk comparison: Audi A4 Avant vs Peugeot 208

Biggest Differences
The Audi A4 Avant offers significantly more cargo length: folded down there is +20.5 in (40%) more and with the first row of seats upright +15 in (57%) more than in the Peugeot 208. The trunk opening of the Audi is also larger: the opening height is +3.9 in (13%) higher and the opening width +6.3 in (19%) larger than the Peugeot.
In contrast, the Peugeot has a significantly greater depth between the loading edge and the trunk floor: +5.1 in (260%) compared to the Audi, and its loading edge sits overall +3.1 in (13%) higher above the road. The narrowest width in the trunk differs only slightly (Audi +1.2 in / 3%), which is negligible.
Impact on Usability
These differences lead to clear practical effects: For long or wide items (e.g., slats, skis, long furniture parts), the Audi A4 Avant is clearly advantageous due to the significantly longer loading length and the wider opening — it accommodates longer and bulkier cargo more easily.
The higher opening height in the Audi also facilitates the transport of tall items.
The Peugeot scores with the greater depth between the loading edge and the trunk floor: this creates more usable interior height below the loading edge, which can be advantageous when storing lower-lying, bulky luggage or when covering cargo.
However, because the Peugeot's loading edge is higher above the ground (+3.1 in), lifting heavy items into the trunk is more strenuous than with the Audi.
In combination, this means: Peugeot offers more "vertical space under the edge" inside, Audi offers easier loading and unloading as well as more length and width for bulky loads.
Conclusion: Those who regularly transport long or wide goods or frequently load heavy items benefit more from the Audi A4 Avant. Those who need more storage space in deeper areas and can live with a higher loading edge will find a practically usable, though more compact, cargo space in the Peugeot 208.