Our ice cube tray box is easy to use. Simply fill it as you would a bottle, pull the straps, and serve the ice with ease. You get 18 ice cubes per refill. It is thermo-effective, minimizing melting even after several hours of being at room temp. Pour out melted water to ensure only the ice mixes in your drink. You can take this anywhere! Enjoy clean, fresh ice on demand. It's perfect for picnics, outings, and road trips. These ice trays are designed for stacking.