Trunk comparison: Audi A6 Sedan vs Nissan Rogue Sport

Key Differences
The Audi A6 offers significantly more cargo length: with the rear seats folded down, the trunk is +11.8 in (18%) longer, and with the front seats upright, even +11 in (32%) compared to the Nissan Qashqai. The depth of the trunk (loading edge to trunk floor) is also noticeably greater in the Audi: +2.4 in (100%).
In contrast, the Qashqai has a significantly higher trunk opening (+11.8 in / 60%) and a wider opening (+7.1 in / 19%) as well as a higher loading edge to the road (+4.3 in / 17%). The width at the narrowest point differs only slightly (+0.8 in / 2%) and is therefore irrelevant for most uses.
Impact on Usability
Due to the greater cargo length and increased depth, the Audi A6 is better suited for longer or flat-lying items: furniture boards, skis, or longer boxes fit more easily and can lie flatter, which simplifies stacking.
The overall larger usable cargo volume also favors the A6 for transports that rely on length and depth.
The Qashqai, on the other hand, scores points with bulky or tall items: the significantly higher and wider trunk opening makes loading and unloading voluminous, tall, or wide items easier because more clearance height and width are available.
However, the higher loading edge means more lifting is required when loading — this can make heavy lifting more difficult or increase the risk of back strain.
In summary: For long, flat-load cargo, the Audi A6 is more practical; for bulky, tall, or wide items and easy access to the cargo area, the Nissan Qashqai is more suitable. The choice depends on whether you value more the length/depth of the cargo space (A6) or the opening size and access height (Qashqai).