The 1lb Ice from Yeti is the perfect ice pack filler for every cooler. Freeze the 1lb Yeti Ice until all of the liquid inside is solid ice. This ice-pack is non toxic & safe to store with fresh food. To keep your food or beverage cool on your adventure, it is good practise to "pre-cool" the cool box before you head out on your adventures. Due to it's small size, the 1lb (450g) ice packs works really well to fill up empty space inbetween your items inside the cooler. Make sure you freeze the 1LB Ice Pack solid before you use it. Put the frozen icepack inside the cooler a few hours before you fill it up with the food or beverage you want to take with you, to keep cool. This allows the cooler to ratain the cold inside more efficiently. The Yeti Ice pack has a custom shape which lowers the freezing time, ready to be used for the next day. The Yeti Ice will keep your cooler & its contents colder for longer & will last wear & tear thanks to its added impact resistance, it will not break.