The PlanetBox ColdKit was designed to keep your lunch cool throughout the day. The ColdKit allows you to cover your PlanetBox in a blanket of ice, which can stay cold for up to 8 hours. This ice pack is made with purified water, so there will be no synthetic gel mess to worry about. The washable fabric sleeve prevents excessive sweating. Compatible with all three lunch packing systems: Launch, Rover and Shuttle.