Short answerStore dry ice in a foam or insulated cooler with a loose lid, in a ventilated space, away from kids and pets. Never seal it airtight.
Best containers
- A foam (styrofoam) cooler: insulated and not airtight.
- A regular cooler with the lid left unlatched.
Never store it in
- A sealed plastic bottle or glass jar.
- A small closet, walk-in cooler or other confined space.
- A car cabin.
Keep it longer
Wrap it in newspaper or a towel and fill empty space in the cooler. Expect it to shrink about 5 to 10 pounds a day either way.
Sources (checked October 27, 2026)
General guidance, not professional safety advice. Follow your supplier’s and carrier’s instructions.