Before you buy or hire
What size roof box do I need?
Count the luggage first. A litre estimate is more useful than guessing from the box's outside length.
Estimate your roof box sizeCapacity is only one check
Roof boxes commonly range from compact boxes around 300 litres to large boxes around 500 litres or more. Luggage shape, internal openings and spare room matter. Always check your vehicle's roof load and the roof bars.
Put heavy items in the boot where possible, and treat this tool as a shopping starting point rather than a safety approval.