Passive cooler box for camping or shopping in the height of summer. Enjoy fresh food every day with the Outwell Fulmar 20L cooler box. This smart box keeps items frozen for up to 4 days. This way, you can spend less time going to and from the stores and more time enjoying ice creams in the sunshine. The cooler box works with ice or an Outwell Ice Block and features a drain valve to remove excess water. Strong handles make it easy to move.