At 20% longer-lasting than standard water ice blocks, these lightweight freezer blocks are simply popped into your freezer until frozen, then... To have an ICE day, we recommend you pack a medium (16–30 quart) hardside cooler with at least 1 Performance Ice Large Brick, large (48–75 quart) hardside coolers with 3 & extra-large (94–165 quart) hardside coolers with at least 2 This large modular ice block is next-level with a unique brick shape designed thicker to hold more of our supercharged freezing gel with a relatively small surface area, which means it keeps your large cooler ice-cold way longer and the refreshments inside enjoyably frosty. A sealed unit with non-toxic Igloo Ultratherm gel, the Igloo Maxcold freezer block delivers extended cooling performance. Available in a range of sizes to suit all coolers, the Igloo Maxcold Ultratherm Ice blocks are convenient and effective, and up-to 20% longer lasting than standard ice blocks Modular design for a customizable chill Igloo 25079 Natural Ice Pack for Coolers, 2-Pound Cooler Ice Substitutes Large Reusable Ice Packs For Coolers - Camping Togo Ice Block