Campingaz Powerbox 36L Classic

Best price: £99 | Size: 36 litres

This Campingaz cooler was among the best at using space. It can be used upright like a domestic fridge and claims to take nine 1.5-litre bottles; we squeezed in three two-litres with room to spare. That big space takes a while to cool, but it still got down to 13 deg C below room temperature.