The volume of a car fridge refers to the total space inside the fridge that is available for storing food and drinks. It is measured in litres (L). Car refrigerators generally range from 10 to 50 litres. Small car fridges with a capacity of around 10-15 litres are ideal for short trips or for use by an individual. Larger car fridges with a capacity of 30-50 litres can provide enough space to store food and drinks for multi-day trips or for more people.