Trunk comparison: Audi A3 Sportback vs Ford Focus

Key Differences
With the front seats upright, the trunk lengths of both models are the same. When the rear seats are folded down, the Ford Focus is 2.4 in (≈4%) longer than the Audi A3 Sportback.
The trunk opening of the Focus is 1.2 in (≈4%) higher, and the entry width is 1.2 in (≈3%) larger; at the narrowest point, the Focus is 0.8 in (≈2%) wider. The loading edge of the Focus is 0.8 in (≈3%) higher above the ground.
Only the depth of the trunk (loading edge to trunk floor) is significantly larger: the Ford Focus is 0.8 in (+13%) deeper than the Audi A3 Sportback here.
Impact on Usability
The 13% greater depth in the Focus means noticeably more usable volume vertically below the loading edge — practical for transporting taller or bulkier items that would otherwise extend above the loading edge.
This makes it easier to store boxes, trolleys, or bulky parts since there is more space below the loading edge.
The 4% longer length with folded seats in the Focus offers a slight advantage when transporting longer items, but this is only marginally noticeable in practice.
The slightly higher trunk opening and somewhat larger opening width of the Focus make it easier to load wider or taller cargo, while the loading edge that is 0.8 in higher can make lifting heavy items a bit more difficult — especially compared to the lower loading edge of the A3. The minimally greater width at the narrow point in the Focus provides only a small advantage when passing wider items.
In summary: The Ford Focus mainly offers a real usability improvement for bulky or taller cargo due to the greater depth; the other differences are minor and only slightly affect everyday practicality.