LONG journeys, whether a day trip or weeks in a camper van, invariably involve regular visits to cafés or motorway services. Doing this can be seriously expensive, so taking food and drink with you in a cool box is a practical way to save some money.
We reckon that 20-24 litres is about right for a smallish picnic, although for a family spread, 30 litres-plus would be better. Most boxes can run from the mains as well as 12V, making them more versatile. The same applies to boxes that can heat as well as cool.
The aim of any box is to maintain the temperature of food/drink that has already been cooled or heated. Most boxes work by using a simple motor in the lid and are on or off, with
