Before using cooler boxes ensure that there is no unpleasant smell, mildew or mould buildup. Check that there is no damage or cracks and that the inside is clean and dry.Place some ice on the bottom, insert the ice pack dividers where required and fill with food and drinks. Cover with more ice. Perishable foods should be placed directly on ice or packed in food-safe plastic containers.Close the cooler box or bottle and keep it in shade and away from sunlight. To keep the cool temperature longer, you may wrap the cooler box with a wet, light-coloured towel or bury it in the ground up to the edge of the box.After each use empty any remaining contents and water from melted ice. Clean with warm water and mild detergent inside and outside and dry with lint-free cloth. Leave to air dry completely with the lid open.Store in a dark place to prevent fading of the colours and prolong the life of the Ultratherm foam.