Yes. CryoStork Dry shippers including 20 litre models are IATA approved for international air freight because they contain no free liquid nitrogen. The absorbent inner lining holds LN2 safely within the material, making them fully compliant for shipping frozen biological samples including IVF embryos, oocytes and sperm by air courier worldwide. Always ensure your dry shipper is fully charged and drained of free liquid at least 12 hours before dispatch.