Trunk comparison: Audi A6 Sedan vs Skoda Octavia Wagon

Key Differences
The most notable difference is the significantly higher trunk opening of the Škoda Octavia Wagon: it is 11 in (56%) higher than that of the Audi A6. This makes loading tall items (e.g., furniture, plants, tall boxes) much easier because less tilting or turning is required.
Additionally, the Audi A6 has a greater depth of the cargo area (loading edge → trunk floor): this is 0.8 in (20%) larger in the A6 than in the Octavia. As a result, luggage sits lower in the A6 and can be stacked and secured better, which is especially advantageous for bulky or tall stacks.
Other Differences and Practical Consequences
The differences in trunk length (A6 +3.5 in with folded seats / +2.4 in with upright front seats) as well as the slightly greater narrowest width of the A6 (+0.8 in) are minor and only marginally increase usable space.
The loading edge of the A6 is only 0.8 in higher above the road (≈3%) — this makes hardly any noticeable difference when handling heavy loads. The width of the Octavia’s trunk opening is +3.5 in (10%) larger, which facilitates sliding in wider items, although this difference is just at the threshold for emphasis.
Conclusion — Usability
If you frequently transport tall items or often need to load bulky, tall parts, the Škoda Octavia Wagon is more practical due to the significantly higher opening.
If you value a deeper cargo area for secure stacking and household-length items, the Audi A6 offers advantages through greater depth and slightly longer loading surfaces.
For most everyday users, the smaller differences are not critical; the choice depends on whether there is more need for vertical clearance (Octavia) or a deeper, stack-friendly cargo floor (A6).