The Ice Block 400ml can be placed in a freezer overnight and will keep food and drinks cool for hours. Each ice pack contains a non-toxic aqueous liquid and a heat-sealed, leak-proof cap for extra protection from leakage. Perfect for use in all types of cool boxes and soft cooler bags, it will keep food and drinks cool and fresh for hours. The twin pack is ideal for sharing or for using in different situations. The dimensions are H16 x W9 x D6.4 cm and it has a capacity of 400ml.