Step 1. Place one bag of 'prepared' dry ice into the bottom of the cooler.

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Step 2. Place 2 boxed caps on top of the prepared dry ice at the bottom      of the cooler.

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Step 3. Place a 2nd bag of prepared dry ice onto the boxed caps.

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Step 4. Place 2 more caps on top of the 2nd layer of  bagged dry ice.

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Step 5. Place 3rd bag of prepared dry ice onto the top of the 2nd pair of boxed caps.