Trunk comparison: BMW X2 vs VW Golf Wagon (Mk5)

Key Differences
Four major differences stand out from the data: The VW Golf 5 offers a trunk that is +4.7 in (≈13%) longer with the front seats upright than the BMW X2. The trunk opening of the Golf is +3.1 in (≈12%) higher.
In the BMW X2, the distance from the loading edge to the trunk floor is +1.6 in (≈80%) greater, and the loading edge itself is +6.3 in (≈25%) higher above the ground in the X2. Smaller or negligible differences: The Golf has +1.6 in (≈2%) more length with the seats folded down and an opening that is +0.8 in (≈2%) wider; the narrowest width of both trunks is the same.
Impact on Usability
The higher values in the Golf (longer trunk with rear seats up, higher opening) make it more practical in everyday use for elongated or tall items that need to be transported with the rear bench occupied, and facilitate loading tall cargo through the larger opening height.
The slightly larger opening dimension also supports loading bulky items.
The BMW X2 offers more space "under" the loading edge due to the greater depth between the loading edge and the trunk floor — this can help when flat items or luggage need to be placed lower.
Conversely, the significantly higher loading edge of the X2 makes lifting heavy loads into the trunk more difficult: loading heavy boxes or luggage requires more strength or aids.
With fully folded seats, the length difference (≈2%) is marginal and hardly affects usability. In summary: For frequent loading of tall or long items with the rear bench occupied and for easier handling during loading and unloading, the VW Golf 5 is advantageous.
For somewhat more "interior depth" at trunk floor level, but with higher effort when lifting, the BMW X2 is more suitable.