Keep them chilled! Keep your drinks cold and refreshing with the Ice on the Box freezer gel pack. Safety tested for kids, keep this sleeve in the freezer until needed and slip it on the bottom of your Drink in the Box, filled with cold liquids. The stirrup on the bottom will keep it from slipping off, as it keeps your water, fresh juice or even MILK cold until lunch time. It even keeps the rest of the lunch cold at the same time!