Step 1. While wearing both eye protection and gloves place slab(s) of dry ice into Hefty  bag.
             Zip half closed. DO NOT ZIP to close completely.

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Step 2. Place bagged dry ice into another Hefty bag with the zip closure facing

             in the opposite direction. Zip halfway closed.

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​Step 3. Break bagged dry ice into chunks @ 1/2-1 inch in size. The easiest way to do this 

              is by dropping the bag onto a clean concrete surface. 

             Repeat until you have 6 double bags of dry ice.

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This method of packing allows for easier handling and less chance of coming into direct contact with the dry ice, which at -78.8° Celsius can burn.