Smash 34481 Ice Sheets Slim Design Reusable are the trendiest way to keep your food cold, fresh, and safe! Avoid the clutter and inconvenience of ice by using a specially designed reusable Slim Ice Sheet. Slim Ice Sheets are thinner than conventional Freeze Bricks, so they chill the contents of your cooler faster. They also provide additional flexibility and room for packaging foods. Simply freeze overnight and toss in your lunch bag, and you're good to go!