How to Use Dry Ice in a Cooler

Whether you are packing frozen food for a camping trip, transporting perishable goods, or preparing for an event, maintaining the right temperature can be challenging when mechanical refrigeration is unavailable.

Dry ice provides more powerful cooling than conventional ice and does not leave behind meltwater. However, getting the best results requires the right cooler, packing method, quantity, and safety precautions.

This guide explains how to use dry ice in a cooler, where to position it, how long it may last, and how to handle it safely.

Why Use Dry Ice in a Cooler?

Dry ice provides powerful cooling that can keep food and other temperature-sensitive items frozen when mechanical refrigeration is unavailable. It has a temperature of approximately −78.5°C (−109.3°F), making it considerably colder than conventional water ice.

Because dry ice changes directly from a solid into carbon dioxide gas, it does not melt or leave standing water in the cooler. This helps keep packaging and other contents dry while reducing the cleanup associated with conventional ice.

Dry ice is available in several forms, including:

• Blocks
• Slices
• Flakes
• Pellets

Larger, compact pieces are generally better suited to sustained cooling, while smaller pieces can distribute cooling more quickly throughout the container.

These properties make dry ice a practical option for keeping cooler contents frozen during camping trips, outdoor events, power outages, and the transportation of frozen or temperature-sensitive products.

How to Use Dry Ice in a Cooler

Begin by checking that the cooler is suitable for dry ice. Use a hard-sided, insulated container that can withstand very low temperatures and allow carbon dioxide gas to escape.

Dry ice must never be placed in an airtight container because the gas produced during sublimation can increase pressure until the container ruptures.

Follow these steps when packing the cooler:

1. Prepare the contents. Chill or freeze the items before placing them in the cooler. Starting with cold contents reduces the amount of cooling needed after the cooler is packed.
2. Protect the cooler and its contents. Wrap the dry ice in several layers of newspaper or place cardboard between it and the contents.
3. Arrange the cooler according to the required temperature. If the goal is to keep food frozen, place the packaged contents in the cooler and put the wrapped dry ice on top.
4. Fill unused space. Pack empty areas with crumpled newspaper or another suitable insulating material. This limits the amount of warm air surrounding the dry ice, helping it sublimate more slowly and last longer.
5. Close the cooler promptly. Open it only when necessary. Each opening allows warmer air to enter, increasing the heat entering the cooler.

Dry ice can freeze items that would normally only be refrigerated. Foods or beverages that could be damaged by freezing should therefore be separated from direct exposure to it. When the objective is refrigeration rather than freezing, conventional ice or frozen gel packs may offer easier temperature control.

Should Dry Ice Go on the Top or Bottom of a Cooler?

For frozen contents, dry ice is generally placed on top so the colder air can move downward through the cooler. Wrap it in several layers of newspaper to protect the food and cooler liner from direct contact.

The best arrangement can change when the contents only need to remain refrigerated. One option is to place wrapped dry ice beneath a layer of conventional ice, with chilled items positioned above it. This creates separation between the dry ice and products that may be damaged by its extremely low temperature.

Regardless of placement, do not allow dry ice to touch bare food, cans, glass containers, or cooler surfaces that the manufacturer has not approved for dry-ice use. A layer of cardboard or newspaper provides a physical barrier and additional insulation.

How Long Does Dry Ice Last in a Cooler?

There is no single reliable lifespan for dry ice in a cooler. As a general rule of thumb, approximately 10 pounds of dry ice may sublimate within 24 hours in a standard insulated container.

Thicker insulation and a fuller container can help slow the process. This figure is useful as preliminary planning guidance, but it is not a guarantee for every cooler or application.

Actual performance depends on several interacting factors:

• The amount of dry ice
• Its shape and exposed surface area
• Cooler size and insulation
• The initial temperature of the contents
• Outdoor or ambient temperature
• Unused space inside the cooler
• How often the lid is opened
• Whether the goal is refrigeration or freezing

Research confirms that geometry can substantially affect sublimation. The 2025 Journal of Food Science study found that volume-to-surface-area ratio was a significant performance factor and that equal masses with different shapes did not sublimate at the same rate.

Determine the required quantity based on:

• Cooler size
• Intended application
• Expected conditions
• Required cooling duration
• Target temperature

For critical shipments or regulated materials, use validated packaging and temperature-monitoring procedures rather than relying on a general estimate.

How Long Does Dry Ice Last in a Cooler?

There are a number of ways to help dry ice last longer in a cooler:

• • Use a thick, well-insulated cooler: Confirm that the cooler’s manufacturer permits dry-ice use. Thicker insulation reduces heat transfer into the container.
  • Fill unused space: Use crumpled paper or another suitable insulating material to reduce the amount of warmer air inside the cooler.
  • Keep the cooler shaded: Place it out of direct sunlight and away from other heat sources. Keep it closed and covered when possible.
  • Limit how often it is opened: Each opening allows warmer air to enter. Consider using separate coolers for drinks and perishable food because the drink cooler will probably be opened more frequently.
  • Choose the appropriate dry-ice format: Larger, compact pieces may last longer than the same weight divided into smaller pieces because they expose less surface area. The best format depends on the required temperature and how evenly cooling must be distributed.

Dry Ice Safety Precautions

When handling dry ice, follow these precautions:

• Never handle dry ice with bare hands. Its surface temperature can rapidly freeze skin and eye tissue. Use dry, loose-fitting insulated gloves designed for very cold materials, or handle the dry ice with tongs or another suitable tool.
• Always provide ventilation. One pound of dry ice produces approximately 250 liters, or 8.8 cubic feet, of carbon dioxide gas as it sublimates. That gas can accumulate in enclosed or poorly ventilated areas and may cause headache, dizziness, confusion, breathing difficulty, unconsciousness, or death at elevated concentrations.
• Choose appropriate storage. Do not store dry ice in a household refrigerator, freezer, cold room, or other enclosed appliance. Do not transport it in an occupied passenger compartment.
• Dispose of appropriately. Allow unused dry ice to sublimate in a secure, well-ventilated location. Do not put it in a sink, toilet, drain, trash can, or other confined receptacle.

Reliable Dry Ice Supply From Nippon Sanso

When using dry ice, choosing the right cooler matters. However, it’s also important that the dry ice be in the appropriate format and quantity, delivered close to the time it will be used, and handled correctly.

Nippon Sanso supports these needs with:

• Consistent dry ice blocks and pellets: Multiple formats help customers select an option suited to their cooler size, required cooling duration, and application.
• Delivery designed to minimize sublimation: Insulated containers, appropriate delivery methods, and timing coordinated with the customer’s usage schedule help reduce dry ice loss before use and ensure it arrives when needed.
• Safe-handling support: Guidance on storage, ventilation, and handling helps customers use dry ice safely and effectively.

For camping, events, food transportation, and other temperature-sensitive applications, selecting the appropriate dry ice format and quantity helps maintain the required temperature.

Contact Nippon Sanso to discuss your needs and arrange an appropriate dry ice supply and delivery schedule.