18 Hour Ice Block Pack 2 x 440g (2 x 15.5 Oz) 18 Hour Ice Block Pack 2 x 440g (2 x 15.5 Oz) Put these ice blocks in your cool box, lunch box and keeps your food and drinks cool for up to 18hours! The ideal cooling device for picnics, walks, work, travelling or anytime you are on the go! What is in the box? 2 x 440g 18 Hour Ice Block/Ice Pack