Trunk comparison: Mercedes Benz GLB vs Opel Astra Wagon

Main Differences

The biggest differences concern the depth of the trunk and the height of the loading edge: The Opel Astra Sports Tourer offers a trunk depth measurement that is 0.8 in greater (+17%), while the loading edge of the Mercedes-Benz GLB is 4.3 in higher (+18%). Both values over 10% are therefore noticeable in practice.

Other, smaller deviations: The Astra has only 0.4 in more loading length with folded seats (+1%) and 2.8 in more with the first row of seats upright (+7%).

The trunk opening of the GLB is 1.2 in higher (+4%), the narrowest width in the GLB is 1.2 in larger (+3%), and the opening width of the Astra is 0.4 in larger (+1%).

Impact on Usability

Greater trunk depth in the Astra (+17%) means more usable interior height/cargo space in the longitudinal direction immediately behind the loading edge — advantageous for tall or bulky items that cannot be stacked in height, as well as for better securing of lower-lying cargo.

Combined with the slightly longer loading length with the first row upright (+7%), the Astra is more practical for long, flat-loadable items.

Higher loading edge in the GLB (+18%) makes loading and unloading heavy items more strenuous and complicates easily sliding through longer/rolling loads.

However, a higher loading edge can provide protection against dirt or water intrusion with high ground clearance and uneven terrain, but it is disadvantageous for the accessibility of the cargo area in urban everyday use.

The smaller differences have the following effects: The 1.2 in higher trunk opening and the 1.2 in larger narrowest width in the GLB slightly facilitate loading wider items; the 1–2.8 in longer loading possibilities in the Astra increase flexibility when transporting longer loads.

However, these effects are significantly less relevant than the two above-mentioned >10% differences.

Conclusion: Those who frequently lift heavy or cumbersome items benefit more from the deeper, more easily accessible cargo space of the Astra. Those who transport wider objects and value higher ground clearance have advantages with the GLB but must accept a significantly higher loading edge.