The Mercedes-Benz GLS 450 offers the following dimensions and boot space specifications:

• Overall Length: 205.0 inches
• Overall Width (with mirrors): 84.9 inches
• Overall Height: 71.8 inches
• Wheelbase: 123.4 inches

In terms of cargo capacity, when all seats are upright, the GLS 450 provides 17.4 cubic feet of boot space. If you fold down the third and second rows of seats, the cargo space expands significantly to up to 93.8 cubic feet (with the second and third rows flat), which makes it quite spacious for transporting larger items.

For further detailed information about the GLS 450, you can refer to the following resources:

1. Mercedes-Benz USA - GLS 450 SUV Overview
2. Car and Driver - GLS-Class Features and Specs
3. Mercedes-Benz Greenwich - 2023 GLS Dimensions
4. Edmunds - 2024 Mercedes-Benz GLS-Class GLS 450 4MATIC
5. Mercedes Hoffman - 2024 GLS 450 Interior Features and Dimensions
6. Rallye Motors - GLS Interior and Exterior Dimensions
7. Autoblog - GLS-Class Luggage Test

Next, I'll gather dimensions and boot space details for the Volvo XC90.Here is a detailed summary comparing the dimensions and boot space of the 2025 Mercedes-Benz GLS 450 and the 2025 Volvo XC90.

Mercedes-Benz GLS 450

The Mercedes-Benz GLS 450 is a large luxury SUV with the following dimensions:

• Overall Length: 205.0 inches
• Overall Width (with Mirrors): 84.9 inches
• Height: 71.8 inches
• Wheelbase: 123.4 inches

In terms of cargo capacity, the GLS 450 offers impressive space:

• Cargo Space Behind Third Row: 17.4 cubic feet
• Cargo Space Behind Second Row (with seats folded down): 54.2 cubic feet
• Maximum Cargo Space (with all rear seats down): Up to 93.8 cubic feet.
  This makes it suitable for transporting larger items or multiple pieces of luggage for family trips. Mercedes-Benz USA, Car and Driver GLS specs, Rallye Motors.

Volvo XC90

The Volvo XC90 also ranks highly in the luxury SUV segment with the following specifications:

• Overall Length: 195.3 inches (4953 mm)
• Width (without exterior mirrors): 75.6 inches (1923 mm)
• Height: 69.5 inches (1776 mm)

When it comes to boot space:

• Cargo Space Behind Third Row: 15.8 cubic feet
• Cargo Space Behind Second Row (with seats folded down): 49.6 cubic feet
• Maximum Cargo Volume: Approximately 65.5 cubic feet (published as 680 liters), making it versatile for various cargo needs. Volvo Cars Specifications, Car and Driver XC90 specs.

Summary

In summary, the Mercedes-Benz GLS 450 is larger overall with greater maximum cargo space compared to the Volvo XC90. The GLS 450 offers a maximum of 93.8 cubic feet, while the XC90 provides approximately 65.5 cubic feet at full capacity. However, both vehicles are well-equipped for carrying passengers and cargo comfortably in the luxury SUV segment.